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April 21, 2014

Search: how many moles of helium would it take to fill a balloon with a volume of 1000.0 cm3 when the temperature is 32 C and the pressure is 752 mm Hg

Number of results: 11,936

Chemistry
A helium balloon contains 0.54g of helium. Given the molecular weight of helium is 4.0 g/mol, how many moles of helium does it contain?
Friday, February 22, 2013 at 6:10pm by Mira

Chemistry
A helium ballon contains 0.32g of helium. Given the molecular weight of helium is 4. How many moles of helium does it contain.
Monday, March 31, 2014 at 2:29pm by Anonymous

chemistry
A helium balloon contains 0.26 g of helium. How many moles of helium does it contain?
Monday, November 17, 2008 at 9:12pm by pip

AP Chemistry
Three gases, xenon, helium, and hydrogen are confined in a 10.0 L vessel at a pressure of 7.0 atm. Intially the vessel contains 3.0 moles of xenon, 2.0 moles of helium, and 2.0 moles of hydrogen. What would the partial pressure of helium be if 5.0 moles of hydrogen are added ...
Wednesday, April 6, 2011 at 12:49pm by Paxton

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 helium is present in a helium-oxygen mixture having a density of 0.538 g/L at 25 degrees C and 721mmHg? Express your answer ...
Sunday, October 10, 2010 at 9:34pm by Ellen

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 Helium is present in a helium-oxygen mixture having a density of 0.538 g/L at 25 degrees C and 721 mmHg? Express your answer ...
Sunday, October 10, 2010 at 9:36pm by Ellen

Physics plzzzzzzzzz help
so ? A Goodyear blimp typically contains 4770 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 274 K. What is the mass (in kg) of the helium in the blimp? This is just a case of applying the ideal gas law, n = PV/RT. You know the ...
Friday, December 1, 2006 at 1:57am by maysam

chemistry
the helium in a 1.5L flask at 25degrees celcius exerts a pressure of 56.65kPa. How many moles of helium are in the flask?
Wednesday, January 30, 2013 at 6:16pm by amber

Chemistry
A 1.50mol sample of helium at a certain temperature and pressure has a volume of 31.4L. A second sample of helium at the same temp and pressure has a volume of 42.2L. How many moles of Helium are in the second sample?
Thursday, March 3, 2011 at 7:03pm by naseeb

chem1 WORD PROBLEM!!
6. how many grams are in 4 moles of Be (OH)3? 7.How many atoms are in 4 moles of C6H12O6? 8.how many moles are in 12.04x10 23 to the power molecules of hamburgers? 9. how many molecules are in grams of Helium gas (He2)? hint:convert then moles then moecules
Thursday, December 6, 2012 at 6:51pm by tyneisha

Chemistry
Please tell me which Gas Law equation to use to figure out this problem... A helium balloon at 25C, 1 atm, has a volume of 2.88 L. Additional helium is pumped into the balloon. It now contains 1.20 g of He and its new volume is 7.20 L. How many moles of helium gas did the ...
Saturday, March 23, 2013 at 2:23am by Pam

Physics
A clown at a birthday party has brought along a helium cylinder, with which he intends to fill balloons. When full, each balloon contains 0.036 m3 of helium at an absolute pressure of 1.2 x 10^5 Pa. The cylinder contains helium at an absolute pressure of 1.6 x 10^7 Pa and has ...
Sunday, April 15, 2007 at 1:18am by Mary

physics
A portable steel tank with a volume 35 liters (0.035m) holds helium gas used for filling party balloons. The pressure in the tank is 120atm when at room temperature of 22 C. How many moles of helium gas are in the tank? Each balloon has a volume of 2.5liters when filled with...
Wednesday, January 4, 2012 at 12:14am by sand

chemistry - helium
what colour does helium burn? Helium BURNS a bright orange red color what colour is helium in the spectra? colorless
Wednesday, June 2, 2010 at 9:47am by john

Chemistry
A 6.00 ft cylinder has a radius of 26 in. It contains 189 lb of helium at 25 celsius. Express the volume of the cylinder (V=rh) in liters, the amount of helium in moles and the temperature in Kelvin.
Thursday, September 27, 2012 at 3:48pm by Wendy

chemistry
A gaseous mixture containing 6 moles of oxygen, 8 moles of helium and 6 moles of carbon dioxide in a container under a pressure of 40 atm. Calculate the partial pressure of th3 individual gases.?
Thursday, May 30, 2013 at 12:22am by sagar

chem
A typical party balloon when inflated has a volume of 7.3 L. How many moles of helium are in the balloon if the pressure of helium is 1.2 atm and the temperature is 20.7 C? Take the value of R to be 0.08206 L-atm/mol-K.
Thursday, July 26, 2012 at 8:21am by hhh

CHEm
Amount of Helium in a Blimp The Goodyear blimp Spirit of Akron is 62.6 m long and contains 7023 m^3 of helium. When the temperature of the helium is 280K , its absolute pressure is 110kPa . Find the mass of the helium in the blimp. m=_____kg ty
Wednesday, April 16, 2014 at 4:49am by Brady

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
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

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

Physics
A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...
Friday, October 11, 2013 at 3:32pm by George

Physics
A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...
Friday, October 11, 2013 at 3:34pm by George

Physics
The boiling point of helium at 1 atm is 4.2 K. What is the volume occupied by helium gas due to evaporation of 70 g of liquid helium at 1 atm pressure and a temperature of 6.2 K?
Friday, February 24, 2012 at 4:36pm by Gabe

12th grade physics
Helium is monatomic with a relative atomic mass of 4. calculate (i) the density of helium gas at a temperature of 0 degrees Celsius and a pressure of 101kPa and (ii) the rms speed of the helium atoms under these conditions
Monday, September 20, 2010 at 11:59am by Enya

ap chem
A mole of helium gas contains 6.02x10^23 helium atoms. How many helium atoms are there in a micromole of helium? How many moles of helium does 1.25x10^20 atoms of helium represent? ~I have no idea how to start or what the value of a micromole is? Constructive help would be ...
Wednesday, December 13, 2006 at 8:07pm by sara

physics
A Goodyear blimp typically contains 5400m^3 of helium (He) at an absolute pressure of 1.1*10^5Pa. The temperature of the helium is 280K. What is the mass (in kg)of the helium in the blimp? PLEASE GIVE ME SOME IDEAS TO DO IT!!!THANKS A LOT!!!
Thursday, February 21, 2008 at 9:30pm by Amanda

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 slab of plate glass containing dissolved helium is placed in a vacuum furnace at a temperature of 400 C to remove the helium from the glass. The concentration of helium is constant throughout the glass before vacuum heat treatment. After 10 minutes in vacuum at 400 C, at ...
Saturday, December 21, 2013 at 10:04am by Dick

Physics please help !
A Goodyear blimp typically contains 4770 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is 274 K. What is the mass (in kg) of the helium in the blimp? You asked this twice. See my response to your later post.
Friday, December 1, 2006 at 1:34am by maysam

Chemistry
How many moles are present in 30.0 L of helium gas at STP?
Wednesday, December 1, 2010 at 11:00am by Anonymous

Physics
v(air) = lambda*fair where lambda is the wavelength, fair is the frequency in air v(helium) = lambda*fhelium v(air)/v(helium) = f(air)/f(helium) Look up the speed of sound in air and solve for f(helium)
Wednesday, January 30, 2013 at 11:24am by Jennifer

Physics
A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N?
Friday, October 11, 2013 at 1:41pm by George

CHEM
A cylinder with a movable piston contains 2.00g of helium, He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from ...
Sunday, October 28, 2007 at 11:23pm by K

chem
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 ? Responses chemistry - ...
Friday, September 26, 2008 at 10:02pm by tomi

Physics
A sealed container of volume 0.10 m3 holds a sample of 3.0 x 10^24 atoms of helium gas in equilibrium. The distribution of speeds of helium atoms shows a peak at 1100 ms-1. Caluculate the temperature and pressure of the helium gas. (helium atom 4.0 amu) How do I calculate the ...
Monday, May 19, 2008 at 8:57am by Oli

a&p
In modern blimps, the gas of choice is used to inflate them is helium is safer. Compare and contrast the atomic structure of hydrogen and helium. What characteristics of the atomic structure of helium make it so much less reactive than hydrogen?
Saturday, February 2, 2013 at 7:33am by tameka

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 4:08pm by John S.

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.

chemistry - helium
what colour does helium burn? what colour is helium in the spectra? thanks :)
Wednesday, June 2, 2010 at 9:47am by suzie

Physics plzzzzzzzzz help
Ideal Gas Law: PV = N k T ---> N = PV/(k T) N = 1.387*10^(29) mass of one helium atom is approximately 4*u = 6.642*10^27 kg 4u*N = 921 kg A Goodyear blimp typically contains 4770 m3 of helium (He) at an absolute pressure of 1.10 x 105 Pa. The temperature of the helium is ...
Friday, December 1, 2006 at 1:35am by Count Iblis

chemistry
Initially, there are 33 moles of A and 0 moles of B. How many moles of A and B will be present after the system reaches equilibrium? a) 33 moles A; 0 moles B b) 0 moles A; 33 moles B c) 3 moles A; 30 moles B d) equal amounts of A and B The answer is given as "C" but I dont ...
Wednesday, April 27, 2011 at 9:04pm by Adam

Chemistry
A rubber balloon was filled with helium at 25˚C and placed in a beaker of liquid nitrogen at -196˚C. The volume of the cold helium was 15 cm3 Assuming ideal gas behavior and isobaric conditions, what was the volume of the helium at 25˚C?
Wednesday, September 12, 2012 at 4:36pm by Dia B

Chemistry
A vessel containing 39.5 cm^3 of helium gas at 25C and 106kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 7.7cm^3 of ethanol, what was the final temperature of the...
Tuesday, October 25, 2011 at 11:34pm by Anonymous

Physics
At what temperature is the rms speed of helium molecules half its value at STP (0 C, 1.0 atm})?(answer in K) I think i need to use V_rms=sqrt3kT/m k=1.38e^-23J/K helium has 4g so i think helium molecule is 4/6.02e23 but i don't know how to proceed further then i have to answer...
Sunday, November 22, 2009 at 1:46am by ana

Chemistry
How many moles of helium gas are there in a 10-liter balloon, inflated to a pressure of 1.00 atm at a temperature of 300K
Monday, August 8, 2011 at 11:44pm by kortnie

science
because helium has a lower density the oxygen- ie the molecules weigh less in helium
Tuesday, November 10, 2009 at 5:51pm by Rain

science-6th grade
what is between the helium particles in a helium filled balloon?
Friday, November 5, 2010 at 10:03pm by charlie

chemistry
A helium-filled balloon of the type used in long-distance flying contains 420,000 ft3 (1.2 times 107 L) of helium. Suppose you fill the balloon with helium on the ground, where the pressure is 737 mm Hg and the temperature is 16.0 C. When the balloon ascends to a height of 2 ...
Friday, March 30, 2007 at 1:27am by Helpme

science
how many helium atoms must undergo fusion at 100 million K in the helium flash?
Wednesday, February 7, 2007 at 7:34pm by bolometric

Chemistry
Calculate the pressure, in atmospheres, of 2.80 moles helium gas in a 18.0 liters container at 24 degrees celcius.
Thursday, June 21, 2012 at 9:54pm by Christinaa

Chemistry
3 moles A x (3 moles C/2 moles A) = 4.5 moles C. 4 moles B x (3 moles C/4 moles B) = 3 moles C. Both answers can't be correct; the correct one in limiting reagent problems is ALWAYS the smaller value.
Monday, October 10, 2011 at 4:49pm by DrBob222

Math
The question is: The freezing point of helium is -272 degrees celsius. The original temperature of a sample of helium is 3 degrees celsius. a.How much must the temperature change to ensure that helium freezes? -AND- b.Assume the temperature changed at a stedy rate for 25 ...
Monday, September 22, 2008 at 4:40pm by Ali

physics
find the mass of a balloon filled with helium if its volume is .25 m cubed the density of the helium is .178
Sunday, September 2, 2012 at 6:10pm by Ashley

physics
find the moles of helium from PV=nRT Now,knowing the moles, find the volume at the altitude. PV=nRT, solving for volume
Sunday, April 22, 2012 at 5:40am by bobpursley

Physics
Useful Constants: 1 Torr = 133.32 Pa; R = 8.3145 J/molK You have a thin metal sphere of unknown volume that contains helium gas at low pressure. You put the entire metal sphere into a bath of liquid nitrogen, and a pressure gauge on the sphere indicates a pressure of 288 torr...
Monday, November 16, 2009 at 5:00pm by Ellie

Chem
A balloonist is preparing to make a trip in a helium-filled balloon. The trip begins in early morning at a temperature of 15 degrees C. By midafternoon, the temperature has increased to 30. degrees C. Assuming the pressure remains constant at 1.00atm, for each mole of helium, ...
Monday, March 17, 2014 at 8:28pm by Amber

chemistry - helium
Helium burns a bright orange red color when put inside a neon sign tube.
Wednesday, June 2, 2010 at 9:47am by Graham Wu

chemistry
A helium atom weighs 6.65 X 10 to the negative 24 grams. How many helium atoms are contained in a 1.0 g sample?
Saturday, April 16, 2011 at 8:24pm by Lindsey

chm
A cylinder with a movable piston contains 2.00 of helium,He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2....
Friday, October 10, 2008 at 6:40pm by sarah

Chemestry
A cylinder with a movable piston contains 2.00g of helium, , at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2....
Saturday, October 3, 2009 at 7:28pm by Monica

History
Helium doesn't react with any other substance. Is it accurate to say that helium has no chemical properties? Explain. Please help because I'm not sure of the answer. Thank you.
Friday, September 13, 2013 at 11:13pm by Sarah

Science
Helium doesn't react with any other substance. Is it accurate to say that helium has no chemical properties? Explain. Please help because I'm not sure of the answer. Thank you.
Friday, September 13, 2013 at 11:15pm by Sarah

chem
A balloon filled with 22.3 mol helium has a volume of 500. L at 0.0C and 1.00 atm pressure. The temperature of the balloon is increased to 38.0C as it expands to a volume of 570. L, the pressure remaining constant. Calculate q, w, and E for the helium in the balloon. (The ...
Monday, November 26, 2007 at 1:31pm by mel

chem
A balloon filled with 22.3 mol helium has a volume of 500. L at 0.0C and 1.00 atm pressure. The temperature of the balloon is increased to 38.0C as it expands to a volume of 570. L, the pressure remaining constant. Calculate q, w, and E for the helium in the balloon. (The ...
Monday, November 26, 2007 at 5:31pm by mel

science
1. the molar mass of helium is 4.00 g/mol. calculate the volume of 1 mol of helium at STP (T = 273, P = 1 atm) what is the density of helium at STP? 2. the density of an ideal gas is 1.35 kg/m^3. if the temperature is Kelvin and the pressure are both doubled, find teh new ...
Wednesday, April 23, 2008 at 10:17pm by billystar

General Chemistry
A cylinder with a movable piston contains 2.00g of helium,He, at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was chanded from 2...
Wednesday, June 20, 2012 at 1:02pm by Kim

Chemistry
A vessel containing 39.5 cm3 of helium gas at 25C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 17.8 cm3 of ethanol, what was the final temperature of ...
Sunday, January 20, 2013 at 8:54pm by jacfar

Chemistry
A vessel containing 39.5 cm3 of helium gas at 25C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 17.8 cm3 of ethanol, what was the final temperature of ...
Sunday, January 20, 2013 at 11:52pm by jacfar

Chemistry
A vessel containing 39.5 cm3 of helium gas at 25C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 17.8 cm3 of ethanol, what was the final temperature of ...
Thursday, January 24, 2013 at 4:13pm by flame

Chemistry
A vessel containing 39.5 cm3 of helium gas at 25C and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If this required 18.8 cm3 of ethanol, what was the final temperature of ...
Sunday, September 22, 2013 at 2:40pm by Hannah

Physics
For an elastic collision, both kinetic energy and momentum are conserved. Conservation of momentum m(He)*v(He,initial) = m(He)*v(He,final) + m(H)*v(H) where m(He) is the mass of the Helium, v(He, inital) is the initial speed of the Helium , etc. . . Conservation of kinetic ...
Wednesday, November 28, 2012 at 7:23pm by Jennifer

Chemistry
How many moles of gas in a helium filled tank with a volume of 4.00 L when thepressure inside is 365 atm andthetemperture is 33 degrees Celsius
Saturday, April 9, 2011 at 9:17am by Jim

chem
A vessel containing 39.5 cm^3 of helium gas at 25 degrees celsius and 106 kPa was inverted and placed in cold ethanol. As the gas contracted, ethanol was forced into the vessel to maintain the same pressure of helium. If tihs required 7.7 cm^3 of ethanol, what was the final ...
Sunday, November 9, 2008 at 4:25pm by Anna

physics
Spaceman Spiff sits just outside the Milky Way galaxy with a cup of liquid Helium which is at approximately 4K (-269 0C). He has with him a small sphere made entirely of copper which is at a temperature of 219K (-54 0C). After a certain amount of time his copper sphere comes ...
Tuesday, April 27, 2010 at 4:50pm by gian

CHEM
How many grams of helium must be added to a balloon containing 8.00 g of helium gas to double its volume. Assume no temp or pressure change.
Tuesday, October 19, 2010 at 11:51pm by Lilli

HELLO I NEED HELP AND NOBODY EVER HELPS ME.
1. the molar mass of helium is 4.00 g/mol. calculate the volume of 1 mol of helium at STP (T = 273, P = 1 atm) what is the density of helium at STP? 2. the density of an ideal gas is 1.35 kg/m^3. if the temperature is Kelvin and the pressure are both doubled, find teh new ...
Wednesday, April 23, 2008 at 11:29pm by billystar

Physics
so i got the answer to be .01804 moles and i know one mole of helium is 4.03 g do i just multiply the two together? and then divide by 10000 to convert g to mg?
Tuesday, May 4, 2010 at 9:49pm by Katy

chemistry
to reduce loss of helium , a pressure vessel is lined with a membrane made of tantalum.the concentrate of helium at the inner surface of the membrane is held constant at 4.44*10^-5kg/cm3, which the concentrate at the outer surface of the membrane is held constant at ...
Sunday, April 28, 2013 at 6:00am by himani.

chemistry
A. ) A goodyear blimp typically contains 5400 m cubed of helium at an absolute pressure of 1.1*10^5 Pa. The temperature of the helium is 280 K. What is the mass (in kg) of the helium of the blimp? B. ) Estimate the spacing between the centers of neighboring atoms in a piece of...
Wednesday, November 17, 2010 at 12:51am by joe

Chemistry
A. ) A goodyear blimp typically contains 5400 m cubed of helium at an absolute pressure of 1.1*10^5 Pa. The temperature of the helium is 280 K. What is the mass (in kg) of the helium of the blimp? B. ) Estimate the spacing between the centers of neighboring atoms in a piece of...
Wednesday, November 17, 2010 at 6:57am by joe

CHEM
A cylinder with a movable piston contains 2.00 of helium, , at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2....
Friday, October 24, 2008 at 6:42pm by Kara

Chemestry
A cylinder with a movable piston contains 2.00 of helium, , at room temperature. More helium was added to the cylinder and the volume was adjusted so that the gas pressure remained the same. How many grams of helium were added to the cylinder if the volume was changed from 2....
Saturday, October 3, 2009 at 7:28pm by Monica

Chemistry
Calculate the pressure of 0.800 moles of helium gas, when the gas is in a balloon with a volume of 2.30 L at a temperature of 32C.
Sunday, March 24, 2013 at 11:32am by Debbie

university physics
A cryogenic storage container holds liquid helium, which boils at 4.20 K. Suppose a student painted the outer shell of the container black, turning it into a pseudo-blackbody, and that the shell has an effective area of 0.615 m2 and is at 3.01102 K. a) Determine the rate of ...
Tuesday, December 4, 2012 at 4:10pm by jane

chemistry
a balloonist is preparing a trip in a helium balloon. the trip begins in early morning at a temp of 15 degrees Celcius. By mid afternoon, the temp has increased to 30 degrees C. assuming the pressure remains constant at 1.00 atm, for each mole of helium, calculate: 1. the ...
Sunday, March 20, 2011 at 11:34am by Joan

science-6th grade
Please try some of the following sites: http://search.yahoo.com/search?fr=mcafee&p=what+is+between+helium+particles+in+a+helium-filled+balloon Sra
Friday, November 5, 2010 at 10:03pm by SraJMcGin

Physics (help steve)
A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in seconds will the ion ...
Tuesday, July 9, 2013 at 5:54am by Kay

chemistry
How many moles of helium gas would it take to fill a balloon with a volume of 1000.0 cm^3 when the temp is 32 degrees C and the atmospheric pressure is 752 mm Hg
Tuesday, April 29, 2008 at 7:53pm by jerson

help physics
A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in seconds will the ion ...
Sunday, July 14, 2013 at 5:51am by Steve

Physics
A helium-4 atom falls from a height h into a tank of gaseous helium atoms at 300 K. What is h in meters if the temperature of the helium atoms remains at 300 K after the falling atom enters the tank? Details and assumptions The acceleration of gravity is −9.8 m/s2. As ...
Tuesday, April 2, 2013 at 8:59am by Crow

SCIENCE,PHYSICS
A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in seconds will the ion ...
Wednesday, July 10, 2013 at 10:58am by GT

Chemistry
The Goodyear blimps, which frequently fly over sporting events, hold approximately 1.9010^5 ft^3 of helium. If the gas is at 25 C and 1.0 atm, what mass of helium is in the blimp?
Sunday, October 4, 2009 at 3:48pm by Monica

Chemistry
Calculate the partial pressure of helium in a 1.00 L flask that contains equal numbers of moles He, Ne, and Ar at a total pressure of 5.26atm
Tuesday, April 10, 2012 at 10:12pm by Randy

chem!
i cant figure this one out! :( a balloonist is preparing a trip in a helium balloon. the trip begins in early morning at a temp of 15 degrees Celcius. By mid afternoon, the temp has increased to 30 degrees C. assuming the pressure remains constant at 1.00 atm, for each mole of...
Monday, March 21, 2011 at 10:15am by Joan

Physics Please Answer
A helium ion is at rest in a laboratory when it is put in an electric field of E=2 N/C. An infrared light, of wavelength 2000 nm, is directed towards the ion. The ion is moving towards the source of radiation. After what time in the laboratory frame in seconds will the ion ...
Saturday, July 13, 2013 at 8:28am by Steve

Chemistry
A sample of helium has a volume of 325mL and a pressure of 655mmHg. What wll be the pressure if the helium is compressed to 125mL (T constant)?
Tuesday, October 9, 2012 at 4:35pm by Mel

Science
Helium gas is added to a ballon already partially filled with helium gas the balloon inflated because the
Sunday, February 5, 2012 at 9:34pm by Star

chemistry
calculate the density of helium in a helium balloon at 21.7 degress celsius. (Assume that the pressure inside the balloon is 1.15 atm.)
Saturday, June 19, 2010 at 10:51pm by Jo-ann

chemistry
Calculate the partial pressure of helium in a 1.00 L flask that contains equal numbers of moles of He, Ne, and Ar at a total pressure of 8.35 atm.
Sunday, May 5, 2013 at 12:33pm by Jenny

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