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April 25, 2014

Search: 7.9 of helium are in a 16 cylinder. The pressure gauge on the cylinder reads 66

Number of results: 720

Chem
A balloon contains 30.0 L of helium gas at 103 kPa. What is the volume of the helium when the balloon rises to an altitude where the pressure is only 25.0 kPa? Assume that the temperature remains constant
Wednesday, January 19, 2011 at 2:30pm by Shrell

Chem
A balloon contains 30.0 L of helium gas at 103 kPa. What is the volume of the helium when the balloon rises to an altitude where the pressure is only 25.0 kPa? Assume that the temperature remains constant
Wednesday, January 19, 2011 at 2:30pm by Shrell

Chem
A balloon contains 30.0 L of helium gas at 103 kPa. What is the volume of the helium when the balloon rises to an altitude where the pressure is only 25.0 kPa? Assume that the temperature remains constant
Wednesday, January 19, 2011 at 2:30pm by Shrell

Physics
A balloon has a volume of 1000 m3 and a mass of 500 kg when empty. When full of helium, what is the maximum mass it can lift off the ground? The density of helium is 0.18 kg/m3 and the density of air is 1.29kg/m3.
Thursday, July 25, 2013 at 9:31pm by Trent Joseph

chemistry
a weather balloon partially filled w/ 33.5 L of helium @ 18 deg C & .95 atm. what volume will helium occupy @ -23 deg C w/ a pressure of 3 x 10 to the -3 atm?
Tuesday, January 29, 2013 at 1:32pm by Annie

Physics
A container having a volume of 1 m3 holds 90 mol of helium gas at 176 ◦ C. Boltzmanns constant is 1.38 10 −23 J/K. Assuming the helium behaves like an ideal gas, what is the average kinetic energy per molecule? Answer in units of J
Sunday, February 10, 2013 at 5:44pm by Conor

chemistry
what colour does helium burn? what colour is helium in the spectra? thanks :)
Saturday, May 29, 2010 at 10:48am by suzie

Chemistry
Fill a balloon with helium gas to a volume of 2.68 L at 23 celsius and 789mmHg. What would the volume of helium if the pressure changes to 632 mmHg but the temperature is unchanged. This is how I solved it V2 = V1 X P1/P2 2.68L X 789/632 = ANSWER V2 =.3.35 L Is this correct
Tuesday, October 23, 2007 at 12:06am by LT

Physics
A helium balloon lifts a basket and cargo of total weight 2250 N under standard conditions, at which the density of air is 1.29 kg/m3 and the density of helium is 0.178 kg/m3 . What is the minimum volume of the balloon? The acceleration of gravity is 9.81 m/s2 . Answer in ...
Monday, December 5, 2011 at 11:31am by help

Chemistry
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of is present in a helium-oxygen mixture having a density of 0.498 at 25 and 721 ?
Sunday, October 7, 2012 at 6:09pm by Ayesha

science
What volume of helium would be in a balloon the size of a soft drink bottle? What's the volume of the small drink bottle? That's how much helium would be there. no the question was WHAT WAS THE VOLUME OF HELIUM WOULD BE IN A BALLOON THE SIZE OF A SOFT DRINK BOTTLE? no the ...
Wednesday, January 31, 2007 at 5:42pm by smart monkey girl96

Chemistry
a sample of helium gas has a volume of 1.25L at -125celcius and 50.0atm. the gas is compressed at 50.0 atm to volume of 325ml. what is the final temperature of the helium gas in Celcius
Monday, April 8, 2013 at 8:37pm by Mckee

college chemistry
A sample of helium occupies 1521 mL at 719 mmHg. Assume that the temperature is held constant and determine a) the volume of the helium at mmHg. b)the pressure, in mmHg, if the volume is changed to 315mL
Tuesday, October 23, 2012 at 11:10pm by Haley

chemistry
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles)of He(g) is present in a helium-oxygen mixture having a density of 0.538g/L at 25celsius and 721mmHg ?
Friday, September 26, 2008 at 8:17pm by tomi

chemistry
a 10.0L ballon contains helium gas at a pressure of 655mmHg, what is the new pressure, in mmHg, of the helium gas at 20.0L, if no change in temp or amount of gas
Thursday, March 1, 2012 at 2:03pm by shaun

chemistry
If helium added to the mixture increases the pressure to 1.90 {\rm atm}, what is the partial pressure ({\rm atm}) of the helium?
Thursday, November 18, 2010 at 10:25pm by Anonymous

physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to move off at an angle =45. The neutron's initial speed is 3.8105 .
Monday, March 29, 2010 at 8:35pm by Anonymous

chemistry
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.528g/L at 25 degree celsius and 721 mmHg ?
Saturday, May 4, 2013 at 7:39pm by molly

Science Question 2
The helium flash converts three helium nuclei to what heavier element? A.beryllium B.boron C.lithium D.carbon E.iron Carbon. Carbon has six protons, obtained from three helium nuclei. http://abyss.uoregon.edu/~js/ast122/lectures/lec16.html A
Monday, December 11, 2006 at 10:07pm by Liz

Science
Helium gas in a balloon occupies 2.5 L at 300.0 K. The balloon is dipped into liquid nitrogen that is at a temperature of 80.0 k. What will the volume of the helium in the balloon at the lower temperature be? I got a weird answer like .66667 and i used charles law
Saturday, February 12, 2011 at 3:42pm by Lauren

Physics
Air is vibrating in a tube (closed at both ends) at its fundamental frequency of 160 Hz. If the tube is filled with helium instead, what is its fundamental frequency? Use 1020 m/s for the speed of sound in helium.
Wednesday, January 30, 2013 at 11:24am by Scott

Physics
Air is vibrating in a tube (closed at both ends) at its fundamental frequency of 160 Hz. If the tube is filled with helium instead, what is its fundamental frequency? Use 1020 m/s for the speed of sound in helium.
Thursday, January 31, 2013 at 5:11pm by lindsey

Chemistry
A helium baloon has a volume of 28.9L, what is the mass of helium inside the ballon? what is the mass of the same volume of air it displaces? MM of air = 29.0g/mol, 25C (temperature) and 1 atm.
Wednesday, November 17, 2010 at 10:13am by Ashley

Chem
Please tell me if these are right? A mixture of oxygen and helium is prepared for a scuba diver that will descend to 125 feet below the ocean surface. At that depth the diver breathes a gas mixture that has a total pressure of 8atm. If the particle pressure of the oxygen in ...
Monday, November 29, 2010 at 1:29pm by Lindsay

chemistry
A weather balloon if it starts with 10 liters of helium at 0km elevation and a temperature of 20 degrees. it is released and rises up through the atmosphere to an elevation of 12km where the temperature is -60degrees. calculate the volume of the helium at 12km.
Sunday, June 3, 2012 at 9:26pm by Cynthia

physics
An ionized helium atom has a mass of 6.6*10^-27kg and a speed of 4.4*10^5 m/s. The atom moves perpendicular to a 0.75-T magnetic field on a circular path of radius 0.012m. Determine whether the charge of the ionized helium atom is +e or +2e. Can anyone please give me some ...
Tuesday, April 1, 2008 at 2:52pm by Kelly

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.31 kg m-3. Under these conditions the total surface area of the balloon is 0.11 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 1:04am by Odesa

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.7 kg m-3. Under these conditions the total surface area of the balloon is 0.52 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 4:18am by Anonymous

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.57 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 7:31am by lena

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.87 kg m-3. Under these conditions the total surface area of the balloon is 0.87 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 8:13am by troubled student

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.5 kg m-3. Under these conditions the total surface area of the balloon is 0.72 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 8:44am by student

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.5 kg m-3. Under these conditions the total surface area of the balloon is 0.72 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 8:57am by student

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.31 kg m-3. Under these conditions the total surface area of the balloon is 0.11 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 9:26am by Paul

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.57 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 12:27pm by timur

chimistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.82 kg m-3. Under these conditions the total surface area of the balloon is 0.39 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 1:23pm by School girl

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.57 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 1:29pm by student

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.87 kg m-3. Under these conditions the total surface area of the balloon is 0.87 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 3:22pm by mangozier

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.79 kg m-3. Under these conditions the total surface area of the balloon is 0.47 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 3:46pm by anonymous

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.86 kg m-3. Under these conditions the total surface area of the balloon is 0.56 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Friday, December 14, 2012 at 11:47pm by kkr

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.57 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 4:54am by anita

Problem
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.92 kg m-3. Under these conditions the total surface area of the balloon is 0.26 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 7:26am by asd

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.92 kg m-3. Under these conditions the total surface area of the balloon is 0.26 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 2:28pm by asd

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.88 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 3:10pm by JoeBob

Physics
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.35 kg m-3. Under these conditions the total surface area of the balloon is 0.88 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 3:11pm by JoeBob

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.66 kg m-3. Under these conditions the total surface area of the balloon is 0.88 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Sunday, December 16, 2012 at 6:01am by meshy

science
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.23 kg m-3. Under these conditions the total surface area of the balloon is 0.46 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Sunday, December 16, 2012 at 11:46am by fatine

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.3 kg m-3. Under these conditions the total surface area of the balloon is 0.33 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Sunday, December 16, 2012 at 12:13pm by T

physics
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.72 kg m-3. Under these conditions the total surface area of the balloon is 0.17 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Sunday, December 16, 2012 at 11:08pm by Anonymous

physics
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.72 kg m-3. Under these conditions the total surface area of the balloon is 0.17 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Sunday, December 16, 2012 at 11:08pm by Anonymous

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.3 kg m-3. Under these conditions the total surface area of the balloon is 0.33 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Sunday, December 16, 2012 at 11:27pm by Please Help Me!!!!!!!!

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.55 kg m-3. Under these conditions the total surface area of the balloon is 0.78 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Monday, December 17, 2012 at 7:18am by hk

math
A study to determine whether or not a football filled with helium traveled farther when kicked than one filled with air found that while the football filled with helium went, on average, farther than the one filled with air, the difference was not statistically significant. ...
Sunday, October 7, 2007 at 5:23pm by Devon

science
The diameter of a neutral helium atom is about 128 pm. Suppose we could lin up helium atoms side by side in contact with one anohter. Approximately how many atoms would it take to make the distance 1 cm from end to end.
Thursday, September 2, 2010 at 7:45am by paulie

chemistry
assume the diameer of a neutral helium atom is 1.40 x 10 to the second power pm. suppose that we could line up helium atoms side by side in contact with one another. how many atoms would it take to make the distance from end to end 9.00cm
Monday, February 21, 2011 at 11:46pm by Anonymous

chemistry
the diameter of a helium atom is about 1*10^2pm.suppose that we could line up helium atoms side by side in contact with one another. aproximately how maney atoms would it take to make the distance from end to end 1cm ?
Friday, September 7, 2012 at 5:04pm by whitney

Chemistry
Assume the diameter of a neutral helium atom is 1.40 x 10^(2)pm. Suppose that we could line up the helium atoms side by side in contact with one another. How many atoms would it take to make the distance 5.80 cm from end to end? How do I solve this, and what is the correct ...
Saturday, September 8, 2012 at 2:09pm by Cassidy

CHEM
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.43 kg m-3. Under these conditions the total surface area of the balloon is 0.68 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 10:01am by Jaigaon

Chemistry
A 10.0 L tank holds helium gas at 82 C and 1.70 atm. What mass of helium gas is in the tank?
Monday, January 24, 2011 at 8:58pm by Hunter

Chemistry
A 10.0 L tank holds helium gas at 82 C and 1.70 atm. What mass of helium gas is in the tank?
Monday, January 24, 2011 at 9:01pm by Hunter

Chemistry
A 10.0 L tank holds helium gas at 82 C and 1.70 atm. What mass of helium gas is in the tank?
Monday, January 24, 2011 at 9:02pm by Hunter

Chemistry
A 10.0 L tank holds helium gas at 82 C and 1.70 atm. What mass of helium gas is in the tank?
Monday, January 24, 2011 at 9:05pm by Hunter

physics
Two copper cylinders, immersed in a water tank at 46.3C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at 46.3C. b) Calculate the ...
Sunday, January 1, 2012 at 9:37am by maria

physics
Two copper cylinders, immersed in a water tank at 46.3C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at 46.3C. b) Calculate the ...
Tuesday, January 3, 2012 at 12:51pm by maria

Physics
Two copper cylinders, immersed in a water tank at 46.3C contain helium and nitrogen, respectively. The helium-filled cylinder has a volume twice as large as the nitrogen-filled cylinder. a) Calculate the average kinetic energy of a helium molecule at 46.3C. b) Calculate the ...
Sunday, January 26, 2014 at 10:24pm by Lyra

CHEMISTRY
IN A CERTAIN EXPERIEMT A SAMPLE OF HELIUM IN A VACUUM SYSTEM WAS COMPRESSED AT 25C FROM A VOLUME OF 6000.0ML TO A VOLUME OF 240.0ML WHERE ITS PRESSURE WAS FOUND TO BE 32.0 MM HG. WAHT IS THE ORIGINAL PRESSURE OF HELIUM? (P1V1)/T1 (P2V2)/T2 Change T to Kelvin.
Monday, January 8, 2007 at 10:15pm by TIFFANY

chemistry
A large cylinder of helium had a small hole through which the helium escaped ata rate of 0.0064 mol/hr. How long would it take for 0.010 mol of CO to leak through a similar hole if it were at the same pressure?
Saturday, May 1, 2010 at 6:18pm by Amy

chemistry
The diving atmosphere used by the U.S. Navy in its undersea Sea-Lab experiments consisted of 0.036 mole fraction O2 and 0.058 mole fraction N2, with helium (He) making up the remainder. What are the masses of nitrogen, oxygen, and helium in a 7.22-g sample of this atmosphere?
Monday, December 20, 2010 at 9:37am by Nagaa

chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.53 kg m-3. Under these conditions the total surface area of the balloon is 0.2 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 9:33pm by mike

Chemistry (balloon)
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.3 kg m-3. Under these conditions the total surface area of the balloon is 0.33 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 2:49am by T

physics
Helium balloons are used regularly in scientific research. A typical balloon would reach an altitude of 45.0 km with an air density of 4.310−3 kg/m3. At this altitude the helium in the balloon would expand to 540000.0 m3. Take g=10 m/s2. Find the buoyant force on the ...
Saturday, December 14, 2013 at 6:40am by Anonymous

Physics
A 1.8-g balloon is filled with helium gas. When a mass of 4.8 g is attached to the balloon, the combined mass hangs in static equilibrium in midair. Assuming that the balloon is spherical, what is its diameter? (The density of helium is 0.179 kg/m3, and the density of air is 1...
Monday, November 7, 2011 at 3:34am by mymi

Chemistry
Each of 2 front tires in the car is filled with a different gas. One tire contains 116 g of helium, another tire has 160 g of unknown gas. How many times heavier is a molecule of the unknown gas than an atom of helium?
Saturday, November 10, 2012 at 8:59am by Christina

chem
3. Each of 2 front tires in the car is filled with a different gas. One tire contains 116 g of helium, another tire has 160 g of unknown gas. How many times heavier is a molecule of the unknown gas than an atom of helium?
Saturday, April 13, 2013 at 10:48am by Anonymous

Physics
A balloon with a mass of 90 kg is filled with helium (density = 0.179 kg/m3). The balloon is spherical and has a diameter of 11.0 m. What is the maximum mass that can be attached to the bottom of this this helium balloon, for it to be able to fly? The density of air is 1.29 kg...
Thursday, January 17, 2013 at 5:28pm by Alphonse

Physics
Helium balloons are used regularly in scientific research. A typical balloon would reach an altitude of 40.0 km with an air density of 4.3*10^-3 kg/m^3. At this altitude the helium in the balloon would expand to 540000.0m^3. Find the buoyant force on the balloon.
Tuesday, December 24, 2013 at 11:07am by Hil

Physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to move off at an angle of 45 degrees. The neutron's initial speed is 5.9105m/s. Determine the speeds of the two particles ...
Friday, October 8, 2010 at 6:43pm by Bartholomew

chemistry
A sample of helium gas has a pressure of 860 mm Hg at a temperature of 225 K. At what pressure (mm Hg) will the helium sample reach a temperature of 675 K.
Monday, November 21, 2011 at 10:49am by Anonymous

physics
The yellow line emitted by a helium discharge tube in the laboratory has a wavelength of 587 nm The same yellow line in the helium spectrum of a star has a measured wavelength of 590 nm. Calculate the speed of the moving star.
Friday, December 14, 2012 at 12:36pm by amy

Physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44 from the neutron's initial direction. The neutron's initial speed is 7.0 105 m/s. ...
Sunday, March 7, 2010 at 10:04pm by Ben

Physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44 from the neutron's initial direction. The neutron's initial speed is 7.0 105 m/s. ...
Sunday, March 7, 2010 at 10:04pm by Ben

Chem 151
The atmosphere in a sealed diving bell contained oxygen and helium. If the gas mixture has 0.200 atm of oxygen and a total pressure of 3.00 atm, calculate the mass of helium in 10.0 L of the gas mixture at 40 degrees Celsius.
Thursday, March 21, 2013 at 9:50pm by Double checking ans

Chemistry
Hi I was reading that in a many electron atom (eg. Helium), it is assumed that each electron occupies its own orbital.. thus,the overall wavefunction (w) is w(1).w(2)... how is this possible?? isn't the 1s orbital of helium filled with 2 electrons so what do they mean that ...
Sunday, December 7, 2008 at 6:24pm by Kimora

college
A gas containing both hydrogen molecules (each molecule contains two hydrogen atoms) and helium atoms has a temperature of 300 K. How does the average speed of the hydrogen molecules compare to the helium atoms?
Friday, October 25, 2013 at 3:50pm by Anonymous

Chemistry
Consider a sample of helium and a sample of neon, both at 30C and 1.5atm. Both samples have a volume of 5.0 liters. Which statement concerning these samples is not true? a- each weighs the same amount b- each has the same # of atoms of gas c- the density of the neon is ...
Friday, November 6, 2009 at 4:36pm by John S.

General Physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle '2 = 45 from the neutron's initial direction. The neutron's initial speed is 6.6x10^5 m/s. Determine ...
Thursday, October 30, 2008 at 3:47pm by Scott

physics
The GoodYear blimp is kept aloft by helium gas which fills a volume of 4559m^3. It can carry a maximum load of 1176kg. How much more mass could the blimp carry if it were filled with hydrogen? Take the density of helium gas to be 0.160kg/m^3 and that of hydrogen to be 0.081kg/m^3
Wednesday, April 10, 2013 at 11:08am by Anna

Science- physics
A balloon weighing 80 kg has a capacity of 1200 m3. If it is filled with helium, how great a payload can it support? The density of helium is 0.18 kg/m3 and the density of air is 1.30 kg/m3. Express your answer in Newtons. I know the answer is 12, 400 Newtons I just don't know...
Sunday, October 23, 2011 at 5:04pm by Hannah

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.31 kg m-3. Under these conditions the total surface area of the balloon is 0.11 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 7:09am by qpt

chemistry
A sample of helium at 20 C occupies a volume of 3.63 L at a pressure of 3.07 atm. What volume does this helium sample occupy if the pressure is reduced to 2.43 atm while maintaining the temperature at 20 C?
Wednesday, April 23, 2014 at 5:29pm by Michelle

Chemistry
A latex balloon, wall thickness 3.091 x 10-4 m, contains helium at a concentration of 0.43 kg m-3. Under these conditions the total surface area of the balloon is 0.68 m2. The diffusion coefficient of He in latex at room temperature is 4.9 x 10-9 m2s-1. Calculate the rate of ...
Saturday, December 15, 2012 at 10:33pm by Stud

chemistry
Mixtures of helium and oxygen are used in scuba diving tanks to help prevent the bends, a condition caused by nitrogen bubbles forming in the bloodstream. If 95 L of oxygen and 25 L of helium at STP are pumped into a scuba tank with a volume of 8.0 L, what is the partial ...
Wednesday, March 20, 2013 at 8:30am by alex

Physics
The density of air near the earth's surface is 1.29 kg?m^3. If a helium balloon with a mass of 1 kg floats in air without rising or falling,what is the minimum volume of helium in the balloon? (presume that the mass of the material making up the balloon is negligible). I am ...
Thursday, February 16, 2012 at 9:37pm by Jonathon

physics
A helium balloon has a mass of 0.022 kg, which includes both the helium and the balloon itself. On this balloon, there is 0.290 N of buoyant force pushing the balloon upward. If I let go of the balloon, find the balloon's acceleration rate in the upward direction. If we ...
Sunday, May 12, 2013 at 1:10am by Nick

Physics
7.7mol of helium are in a 16L cylinder. The pressure gauge on the cylinder reads 65psi. What are (a) the temperature of the gas in Celsius and (b) the average kinetic energy of a helium atom? Part A: so this is what i did T=PV/nR and C=T-273 P=65psi=4.481592e^5Pa V=16L=.016m^3...
Thursday, November 19, 2009 at 9:34pm by ana

classical mechanics
Buoyant Force of a Balloon (9 points possible) Helium balloons are used regularly in scientific research. A typical balloon would reach an altitude of 35.0 km with an air density of kg/m . At this altitude the helium in the balloon would expand to 540000.0 m . Find the ...
Tuesday, December 10, 2013 at 10:42am by socorro

physical science
imagine that you added helium gas to a partially inflated mylar ballon, and expanded as the gas was added. During this expansion process, do you think the pressure of the helium gas inside the ballon increased , decreased or remained fairly constant? Assume the temperature of ...
Tuesday, October 16, 2007 at 2:38am by ashlee

Chemistry URGENT
consider the following container of helium at 45C. intially the valve is closed. After the valve is opened what is the pressure of the helium gas. your start points are 2.00 atm and 9.00L. after opening you have 3.oo atm and 3.00L. The answer is 2.25 atm what formula did you ...
Tuesday, April 1, 2014 at 7:57pm by linda

Physics
The level of water in a clear, colorless glass is easily observed with the naked eye. The level of liquid helium in a clear glass vessel is extremely difficult to see with the naked eye. Explain. (hint: the index of refraction of liquid helium is close to that of air.)
Saturday, March 24, 2012 at 2:00pm by chi

physics
A light spring with a spring constant of 105.0 N/m rests vertically on the table, as shown in (a) below. A 2.05 g balloon is filled with helium (0C and 1 atm pressure) to a volume of 4.64 m3 and connected to the spring, causing the spring to stretch, as shown in (b) below. ...
Thursday, March 14, 2013 at 8:56pm by John Miller

physics
One atom of Deuterium weighs 2.013553AMU. One atom of Helium weighs 4.002602AMU. In nuclear fusion, the process which powers the Sun and all other stars, 2 atoms of Deuterium are combined to form 1 atom of helium. Calculate the energy released by one such combination. (1AMU = ...
Friday, January 22, 2010 at 4:51pm by robin

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