Wednesday

January 18, 2017
Number of results: 86,732

**chemistry**

Under certain conditions, neon (Ne) gas diffuses at a rate of 7.0 centimeters per second. Under the same conditions, an unknown gas diffuses at a rate of 4.9 centimeters per second. What is the approximate molar mass of the unknown gas?

*October 31, 2010 by smith*

**chemistry**

Under certain conditions, neon (Ne) gas diffuses at a rate of 4.5 centimeters per second. Under the same conditions, an unknown gas diffuses at a rate of 10.1 centimeters per second. What is the approximate molar mass of the unknown gas?

*May 26, 2011 by Carly*

**chemistry**

Under certain conditions, neon (Ne) gas diffuses at a rate of 7.0 centimeters per second. Under the same conditions, an unknown gas diffuses at a rate of 4.9 centimeters per second. What is the approximate molar mass of the unknown gas? 6.5 g/mol 11 g/mol 20 g/mol 41 g/mol

*October 31, 2010 by smith*

**Chemistry**

A gas of unknown identity diffuses at a rate of 83.3 mL/s in a diffusion apparatus in which carbon dioxide diffuses at the rate of 102 mL/s. Calculate the molecular mass of the unknown gas. Give your answers in units of g/mol to three significant figures.

*November 17, 2016 by Cali234*

**chemistry**

A gas of unknown molecular mass was allowed to effuse through a small opening under constant-pressure conditions. It required 52 s for 1.0 L of the gas to effuse. Under identical experimental conditions it required 24 s for 1.0 L of O2 gas to effuse. Calculate the molar mass ...

*October 10, 2010 by Jennifer*

**chemistry**

what is the molar mass of the unknown gas that diffuses 0.250 times as fast as hydrogen gas under the same circumstances?

*August 9, 2011 by Aamna Qamar*

**Chemistry**

A gas, Y, diffuses 1.05 times faster than SO2 gas at the same conditions. What is the molecular weight of gas Y?

*December 3, 2013 by Krystal*

**chemistry**

The rate of effusion of a particular gas was measured and found to be 25.0 mL/min. Under the same conditions, the rate of effusion of pure methane (CH4) gas is 46.4 mL/min. What is the molar mass of the unknown gas?

*October 31, 2010 by Mattie*

**chemistry**

The rate of effusion of a particular gas was measured and found to be 23.0 mL/min. Under the same conditions, the rate of effusion of pure methane (CH4) gas is 46.2 mL/min. What is the molar mass of the unknown gas?

*November 7, 2010 by Anonymous*

**chemistry**

If the ratio of the rate of effusion of an unknown gas to that of CO under the same conditions is 0.7978, calculate the molar mass (g/mol) of the gas

*January 15, 2010 by eng*

**Chemistry**

"The analyzer said that at 20degreesC the unknown gas was 82.8% carbon by weight and 17.2% hydrogen. The analyzer also diffused the gas through a special apparatus and measured the rate of its diffusion compared to how fast oxygen gas diffused under the same conditions. The ...

*January 17, 2011 by Anonymous*

**Chemistry**

"The analyzer said that at 20degreesC the unknown gas was 82.8% carbon by weight and 17.2% hydrogen. The analyzer also diffused the gas through a special apparatus and measured the rate of its diffusion compared to how fast oxygen gas diffused under the same conditions. The ...

*January 17, 2011 by Anonymous*

**chemistry**

Ima Chemist found the density of Freon-11 (CFCl3) to be 5.58 g/L under her experimental conditions. Her measurements showed that the density of an unknown gas was 4.38 g/L under the same conditions. What is the molar mass of the unknown?

*November 1, 2014 by please help*

**chemistry**

If 0.45 mol of neon gas occupies a volume of 789 mL at a certain temperature and pressure, what volume would 0.376 mols of neon occupy under the same conditions? what Law is used to solve?

*April 18, 2012 by Anonymous*

**grahams law**

If a molecule of O3 diffuses a certain distance in 3500 s, how long (s) would it take a molecule of Cl2 to diffuse the same distance at the same temperature and under the same conditions?

*April 12, 2011 by Matty*

**AP Calculus**

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e. (0.1)^2 pie C

*January 18, 2011 by Naz*

**Math**

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e. (0.1)^2 pie C

*January 18, 2011 by Naz*

**AP Calculus**

The radius of a circle is decreasing at a constant rate of 0.1 centimeters per second. In terms of the circumference C, what is the rate of the area of the circle, in square centimeters per second? a. -(0.2)pie C b. -(0.1)C c. -(0.1)C/2 pie d. (0.1)^2C e. (0.1)^2 pie C

*January 18, 2011 by Naz*

**Calculus **

Water is leaking out of an inverted conical tank at a rate of cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height centimeters and the diameter at the top is centimeters. If the water level is rising at a ...

*October 16, 2012 by Shayla*

**chemistry**

during an effusion experiment, oxygen gas passed through a tiny hole 2.5 times faster than the same number of moles in another gas under the same conditions. What is the molar mass of the unknown gas?

*July 5, 2014 by Brooklynne*

**Calculus**

A water tank in the shape of a right circular cylinder has a volume that is increasing at the rate of 300pi cubic centimeters per hour. If the height is decreasing at the rate of 15 centimeters per hour, find the rate at which the radius is changing when the radius is 20 ...

*June 23, 2014 by Jake*

**Math( Can you help me with starting this problem)**

How fast does the radius of a spherical soap bubble change when you blow air into it at the rate of 15 cubic centimeters per second? Our known rate is dv/dt , the change in volume with respect to time, which is 15 cubic centimeters per second. The rate we want to find is dr/dt...

*December 17, 2014 by Joan*

**Calculus- Can you help me solve for dr/dt**

How fast does the radius of a spherical soap bubble change when you blow air into it at the rate of 15 cubic centimeters per second? Our known rate is dv/dt , the change in volume with respect to time, which is 15 cubic centimeters per second. The rate we want to find is dr/dt...

*December 29, 2014 by Rachel*

**chem**

An unknown gas Q requires 1.80 times as long to effuse under the same conditions as the same amount of nitrogen gas. What is the molar mass (g/mol) of Q?

*October 12, 2009 by Sheena*

**chemistry**

An unknown gas Q requires 2.17 times as long to effuse under the same conditions as the same amount of nitrogen gas. What is the molar mass (g/mol) of Q?

*March 4, 2011 by ria*

**Calculus**

The volume of a cone of radius r and height h is given by V=1/3pir^2h. If the radius and the height both increase at a constant rate of 1/2 centimeter per second, at what rate, in cubic centimeters per second, is the volume increasing when the height is 9 centimeter and the ...

*November 17, 2009 by jaden*

**AP calculus AB**

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi square centimeters.

*December 29, 2010 by jennifer*

**help on calculus**

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi or 12.56637061 square centimeters?

*December 30, 2010 by winston*

**Chemistry**

Under identical conditions, separate samples of O2 and an unknown gas were allowed to effuse through identical membranes simultaneously. After a certain amount of time, it was found that 4.92 mL of O2 had passed through the membrane, but only 3.04 mL of of the unknown gas had ...

*April 15, 2014 by Peter*

**Calculus**

All edges of a cube are expanding at the rate of 3 centimeters per second. How fast is the volume chang ing when each edge is (a) 1 centimeter and (b) 10 centimeters?

*November 2, 2016 by Brian*

**related rates problem-calculus**

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi square centimeters?

*December 30, 2010 by james*

**chemistry**

If 4.83 mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23 mL of argon, Ar, to effuse through the same hole under the same conditions, what is the molecular weight of the unknown gas?

*October 31, 2012 by Zoe*

**Chemistry**

It takes 32 seconds for a certain number of moles of H2 to effuse through a leak in a tank. An unknown gas was later places under the same conditions; it took 1:39 for the same number of moles to effuse. Find the molecular mass of the gas. I set it up like this: rate of ...

*January 7, 2007 by John*

**Calc**

A beach ball is deflating at a constant rate of 10 cubic centimeters per second. When the volume of the ball is 256/3(pi) cubic centimeters, what is the rate of change of the surface area? (S=4(pi)r^2 and V=4/3(pi)r^3)

*December 22, 2014 by Riley*

**chem 101**

it takes a certain gas 1.98 times as long to diffuse as an equal volume of helium under the same conditions. what is the calculated molecular weight of the gas?

*November 5, 2011 by Anonymous*

**Chemistry**

A sample of unknown gas effuses in 10.6 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.42 min. What is the molar mass of the unknown gas?

*October 7, 2010 by Missy**

**Chemistry**

It takes 200. seconds for a sample of carbon dioxide to effuse through a porous plug and 280. seconds for the same volume of an unknown gas to effuse under the same conditions. What is the molar mass of the unknown gas? Enter your answer to 3 significant figures.

*February 18, 2013 by Olivia*

**chem**

takes 190. seconds for a sample of carbon dioxide to effuse through a porous plug and 295 seconds for the same volume of an unknown gas to effuse under the same conditions. What is the molar mass of the unknown gas? Enter your answer to 3 significant figures.

*April 29, 2013 by sarah*

**AP Chemistry**

The rate of effusion of unknown gas X is found to be about 1.5 times that of SF6 gas (MW=146 g/mol) at the same conditions of temperature and pressure. What is the molecular weight of gas X? Answer in units of g/mol

*February 16, 2014 by Gabriella*

**chemistry**

Effusion/Diffusion Chemistry Help!!! If 4.83mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23mL of Argon, Ar, to effuse through the same hole under the same conditions, what is the molecular mass of the unknown gas? (146amu)

*June 17, 2009 by Capacino*

**chemistry**

Density of phosgene gas, COCl2(MM=99) ander a certain condition is 4.5g/L. What is the density if H2S gas(MM=34) under the same conditions?

*October 20, 2008 by annemarie*

**physics conduction**

a one brick thick wall of 10cm thickness has temperatures 40deg C and 5deg C at the surfaces. if the thermal conductivity of the brick is 0.6W per m per K, what is the rate of heat flow per unit area W per m square through the bricks if steady state conditions apply? explain ...

*June 1, 2012 by ridhi*

**Calculus**

a spherical balloon is inflated with gas at the rate of 500 cubic centimeters per minute. how fast is the radius of the balloon increasing at the instant the radius is 30 centimeters?

*November 1, 2009 by Anonymous*

**chem**

compund containing only C, H, and N yeilds the following data- 1. complete combustion of 34.3 mg of the compund producedmg of CO2 and 40.3 mg of H2O 2. a 65.2mg sample was analyzed by the dumas mthod, giving 35.6 mL of N2 at 740 torr and 25C 3. effusion rate as a gas was 24....

*November 16, 2007 by mel*

**calculus**

the side of a cube is expanding at a constant rate of 2 centimeters per sesond. what is the instantaneous rate of change of the surface area of the cube, in cm2 per second, when its volume is 27 cubic cm

*December 30, 2010 by Felicia*

**chemistry**

at a given temperature and pressure 20ml of the gas diffuses through a porous membrane in 5 seconds. calculate the volume o carbon dioxide which diffuses in 10 seconds if the vapour density of the gas is 11 a)10√(2) b)20/√(2) c)40√(2) d)10/√(2) correct ...

*February 11, 2015 by please............*

**Chemistry #27**

If He(g) has an average kinetic energy of 4410 J/mol under certain conditions, what is the root mean square speed of O2(g) molecules under the same conditions?

*October 13, 2013 by Chelsea*

**chemistry**

If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

*September 28, 2014 by A*

**chemistry**

If He(g) has an average kinetic energy of 7590 J/mol under certain conditions, what is the root mean square speed of F2(g) molecules under the same conditions?

*September 28, 2014 by B*

**Math-Calc**

Water is leaking out of an inverted conical tank at a rate of 14000.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 8 meters and the diameter at the top is 6.5 meters. If the water level is rising at...

*May 24, 2016 by Joey*

**Calculus (pleas help!!!)**

Water is leaking out of an inverted conical tank at a rate of 1100.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 15.0 meters and the diameter at the top is 5.0 meters. If the water level is rising ...

*April 12, 2011 by Cecille*

**calculus**

Water is leaking out of an inverted conical tank at a rate of 60000 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 90 meters and the diameter at the top is 40 meters. If the water level is rising at ...

*November 10, 2009 by Dan*

**Calculus**

Water is leaking out of an inverted conical tank at a rate of 1100.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 15.0 meters and the diameter at the top is 5.0 meters. If the water level is rising...

*April 12, 2011 by Abi*

**Calculus**

Water is leaking out of an inverted conical tank at a rate of 1100.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 15.0 meters and the diameter at the top is 5.0 meters. If the water level is rising ...

*April 12, 2011 by Abi*

**calculus - please help!**

Water is leaking out of an inverted conical tank at a rate of 13200 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 9 meters and the diameter at the top is 7 meters. If the water level is rising at a ...

*November 7, 2011 by archi*

**Engineering Calc.**

Water is leaking out of an inverted conical tank at a rate of 6700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the water level is rising ...

*October 7, 2014 by Tom*

**Chemistry**

Metals lose electrons under certain conditions to attain a noble-gas electron configuration. How many electrons must be lost by the element Ca? Is it 2 e^-? Which noble-gas electron configuration is attained in this process? argon radon krypton xenon helium neon

*October 28, 2012 by Bill*

**Calculus 1**

Water is leaking out of an inverted conical tank at a rate of 13200.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 14.0 meters and the diameter at the top is 3.5 meters. If the water level is rising...

*March 25, 2010 by Anonymous*

**Calc**

Water is leaking out of an inverted conical tank at a rate of 5800 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 8 meters and the diameter at the top is 6.5 meters. If the water level is rising at a ...

*October 28, 2010 by Pierre*

**calculus**

Water is leaking out of an inverted conical tank at a rate of 1600.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 10.0 meters and the diameter at the top is 3.5 meters. If the water level is rising ...

*October 5, 2011 by neil*

**calculus**

Water is leaking out of an inverted conical tank at a rate of 1100 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 15 meters and the diameter at the top is 4.5 meters. If the water level is rising at a...

*October 21, 2011 by Riley*

**math**

Water is leaking out of an inverted conical tank at a rate of 700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 10.0 meters and the diameter at the top is 3.5 meters. If the water level is rising ...

*March 12, 2012 by Justine*

**Calculus**

Water is leaking out of an inverted conical tank at a rate of 13500.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 12.0 meters and the diameter at the top is 5.5 meters. If the water level is rising...

*February 26, 2016 by Taylor*

**Math**

Water is leaking out of an inverted conical tank at a rate of cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height meters and the diameter at the top is meters. If the water level is rising at a rate of ...

*October 15, 2009 by Salman*

**calculus**

Water is leaking out of an inverted conical tank at a rate of cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height meters and the diameter at the top is meters. If the water level is rising at a rate of ...

*October 5, 2011 by neil*

**Calculus**

Water is leaking out of an inverted conical tank at a rate of cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height meters and the diameter at the top is meters. If the water level is rising at a rate of ...

*October 21, 2011 by Riley*

**Chemistry **

a sample of gas of unknown pressure occupies 0.766 L at the temperture of 298k the same sample of gas is than tested under known conditions and has the pressure of 32.6kPa and occupies 0.664 L at 303 k. What is the original pressure of gas

*July 13, 2011 by Rocky*

**physics**

Water is leaking out of an inverted conical tank at a rate of 10700.0 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 7.0 meters and the diameter at the top is 4.0 meters. If the water level is rising ...

*December 10, 2015 by emily*

**Calculus-Math**

The speed S of blood that is r centimeters from the center of an artery is given below, where C is a constant, R is the radius of the artery, and S is measured in centimeters per second. Suppose a drug is administered and the artery begins to dilate at a rate of dR/dt. At a ...

*August 9, 2014 by Lorine*

**calculus(related rates)**

Water is leaking out of an inverted conical tank at a rate of 12200 cubic centimeters per minute at the same time that water is being pumped into the tank at a constant rate. The tank has height 15 meters and the diameter at the top is 6.5 meters. If the water level is rising ...

*May 5, 2012 by jhon*

**math**

This one is kinda hard. "A ballon in the shape of a cylinder with hemispherical ends of the same radius as that of the cylinder is shown. The ballon is being inflated at the rate of 261pi cubic centimeters per minute. At the instant the radius of the cylinder is 3 centimeters...

*November 14, 2007 by greg*

**calculus**

This one is tough. "A ballon in the shape of a cylinder with hemispherical ends of the same radius as that of the cylinder is shown. The ballon is being inflated at the rate of 261pi cubic centimeters per minute. At the instant the radius of the cylinder is 3 centimeters, the ...

*November 14, 2007 by anonymous*

**Calculus-Math**

The speed S of blood that is r centimeters from the center of an artery is given below, where C is a constant, R is the radius of the artery, and S is measured in centimeters per second. Suppose a drug is administered and the artery begins to dilate at a rate of dR/dt. At a ...

*August 9, 2014 by Lorine*

**calcalus**

Water is leaking out of an inverted conical tank at a rate of 12200 cubic centimeters per minute at the same time that water is being pumped into the tank at a constant rate. The tank has height 15 meters and the diameter at the top is 65 meters. If the water level is rising ...

*May 2, 2012 by ali*

**math**

Water is leaking out of an inverted conical tank at a rate of 6700 cubic centimeters per minute at the same time that water is being pumped into the tank at a constant rate. The tank has height 6 meters and the diameter at the top is 3.5 meters. If the water level is rising at...

*November 12, 2014 by Charlie*

**Chemistry**

You are given 7.80g of Bromine gas in a container. Under identical conditions, you have 12.8g of an unknown gas. What is the molar mass of the unknown gas? - so, considering the molar mass of Bromine that I used was 159.808g/Mol, I did: 7.80g Br / 159.808g/mol = 12.8g unknown ...

*September 29, 2015 by Hero*

**AP Chemistry **

At 25 degrees C, a sample of NH3( molar mass 17 g) effuses at the rate of .050 mole per minute. Under the same conditions, which of the following gases effuses at approxiomatesly half that rate? A- O2 B- He2 C-CO2 D-CI2 E-CH4

*November 3, 2015 by Anonymous*

**chemistry 2**

A gas diffuses only 0.5 times as fast as an oxygen molecule at the same temperature. What is the molecular weight of the gas?

*February 16, 2010 by Bob*

**calc 1**

Water is leaking out of an inverted conical tank at a rate of 500.000 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 8.000 meters and the diameter at the top is 6.500 meters. If the water level is ...

*November 6, 2012 by ashley*

**calculus**

3. The radius r of a sphere is increasing at a constant rate of 0.04 centimeters per second. (Note: The volume of a sphere with radius r is v=4/3pir^3 ). a. At the time when the radius of the sphere is 10 cm, what is the rate of increase of its volume? b. At the time when the ...

*January 3, 2012 by Yoona*

**Calculus**

In a right triangle, the hypotenuse is of fixed length of 15 units, one side is increasing in length by 4 units per second while the third side is decreasing in size. At a certain instant the increasing side is of length 9 units. Find the rate of change of the third side at ...

*November 7, 2015 by Bob*

**chemistry**

O2 effuses at a rate that is _____ times that of Xe under the same conditions. rate 02/rate x2 = ?

*June 21, 2013 by Annie*

**calculus**

A potter forms a piece of clay into a right circular cylinder. As she rolls it, the height h of the cylinder increases and the radius r decreases. Assume that no clay is lost in the process. Suppose the height of the cylinder is increasing by 0.5 centimeters per second. What ...

*March 31, 2013 by mike*

**Calculus**

A potter forms a piece of clay into a right circular cylinder. As she rolls it, the height h of the cylinder increases and the radius r decreases. Assume that no clay is lost in the process. Suppose the height of the cylinder is increasing by 0.4 centimeters per second. What ...

*October 20, 2014 by Cookie Monster*

**Math - Variation**

under certain conditions, the thrust T of a propeller varies jointly as the fourth power of it's diameter, d, and the square of the number, n, of revolutions per second. What happens to the thrust if n is doubled and d is halved?

*May 23, 2014 by Kiirsty*

**4 CALCULUS study problem**

1. How fast does the radius of a spherical soap bubble change when you blow air into it at the rate of 15 cubic centimeters per second? Our known rate is dV/dt, the change in volume with respect to time, which is 15 cubic centimeters per second. The rate we want to find is dr/...

*January 9, 2014 by Samantha*

**said**

it was found that in an experiment tthat a gas c diffuses 8.76¡Á10^-1 times faster than nitrogen gas calculate the molecular mass of gas c (n=14)

*August 31, 2016 by saara*

**chemistry**

it was found that in an experiment tthat a gas c diffuses 8.76¡Á10^-1 times faster than nitrogen gas calculate the molecular mass of gas c (n=14)

*August 31, 2016 by saara*

**ap chemistry**

Under certain conditions, the reaction 3A + 2B -> 4C was observed to proceed at a rate of 0.00348 M· s−1. What was the corresponding rate of change in reactant A?

*November 6, 2013 by gabriella*

**Chemistry**

Under certain conditions, nitrogen gas reacts with oxygen gas to form nitrogen monoxide gas. How many total electrons are transferred for each molecule of nitrogen or oxygen?

*March 26, 2016 by Kiana*

**chemistry**

The reaction 2 NO(g) + O2(g) --> 2 NO2(g) is important in forming smog. Under certain conditions, the rate law for a the reaction is rate = 4.0 x 10-3 1/M2*s * [NO]2* [O2] What is the rate when [NO]=0.020 M and [O2]=0.035 M? a. 5.6 x 10-2 M/s b. 9.8 x 10-5 M/s c. 9.8 x 10-8...

*January 10, 2017 by Jessie*

**calculus**

The sides of an equilateral triangle are increasing at the rate of 5 centimeters per hour. At what rate is the area increasing when the side is 10 centimeters?

*October 5, 2010 by nesri*

**Chemistry**

A compound containing only C, H, and N yields the following data. (i) Complete combustion of 34.8 mg of the compound produced 33.3 mg of CO2 and 40.9 mg of H2O. (ii) A 66.3-mg sample of the compound was analyzed for nitrogen by the Dumas method, giving 36.2 mL of N2 at 740. ...

*November 20, 2012 by Darrel*

**Chemistry**

The reform reaction between steam and gaseous methane () produces "synthesis gas," a mixture of carbon monoxide gas and dihydrogen gas. Synthesis gas is one of the most widely used industrial chemicals, and is the major industrial source of hydrogen. Suppose a chemical ...

*April 15, 2011 by BlahxD*

**calculus**

the edge of a cube is increasing at the rate of .05 centimeters per second. in terms of the side of the cube s, what is the rate of change of the volume of the cube, in cm^3/sec

*February 10, 2011 by crystal*

**chemistry**

Effusion/Diffusion Chemistry Help!!! If 4.83mL of an unknown gas effuses through a hole in a plate in the same time it takes 9.23mL of Argon, Ar, to effuse through the same hole under the same conditions, what is the molecular mass of the unknown gas? (146amu) Responses: * ...

*June 18, 2009 by Capacino*

**physics**

2 ants cross a counter 54cm long, one travels at 16 meters per second, and the other at 3.99999 centimeters per second. when the first crosses the finish line how far behind is the second?

*September 11, 2012 by Vitaly*

**physics**

2 ants cross a counter 54cm long, one travels at 16 meters per second, and the other at 3.99999 centimeters per second. when the first crosses the finish line how far behind is the second?

*September 11, 2012 by Vitaly*

**Related Rates**

Water is leaking out of an inverted conical tank at a rate of 500 cubic centimeters per min at the same time that water is being pumped into the tank at a constant rate. The tank has height 10 meters and the diameter at the top is 4.5 meters. If the water level is rising at a ...

*October 14, 2006 by Tom*

**physics**

Falls resulting in hip fractures (or head injuries) are a major cause of injury and even death to the elderly. Typically, the hip’s speed at impact is about 2.0 meters per second. If this can be reduced to 1.3 meters per second or less, the hip will usually not fracture. One...

*February 1, 2016 by tom*