Wednesday
December 17, 2014

Homework Help: Chemistry - Ideal Gas Law

Posted by Black Reaper on Saturday, May 1, 2010 at 7:26pm.

You have a weather balloon that is filled with Helium (He) and has a diameter of 3 ft. Find the mass in grams of the He in the balloon at 21 degrees Celsius and normal pressure. And the density of He with these conditions is .166 g/L.

My Work:
V=4/3 * pi * r^3 V = 14.1 ft^3 * (28.3 L/1 ft^3) = 399 L

T = (21 + 273)K = 294 K

R = .0821 L*atm/(K*mol) ---> Not sure if this is correct value to use.

P = 1 atm ---> Not sure if this is correct value to use.

M = 4.00 g/mol

Using ideal gas law

m = (PMV)/(RT)

m=(1 atm * 4.00 g/mol * 399 L)/(.0821 L*atm/(K*mol) * 294 K)

m = 66.1 g Helium

How does this look?

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