Suppose we wish to inflate a weather balloon with helium. The balloon will have a volume of 100.0 m3 when inflated to a pressure of 0.10 atm. If we use 50-L cylinders of compressed helium gas at a pressure of 100.0 atm. how many cylinders do we need? Assume the temperature remains constant.

Question

Suppose we wish to inflate a weather balloon with helium.  The balloon will have a volume of 100.0 m3 when inflated to a pressure of 0.10 atm.  If we use 50-L cylinders of compressed helium gas at a pressure  of 100.0 atm. how many cylinders do we need?  Assume the temperature remains constant.

joannablackwelder · Answer

Use P1V1=P2P2. Using the pressure and volume of the tank and the pressure of the balloon, calculate the volume produced with each tank. When you use enough to add up to the volume of the balloon, you have your number of tanks. (1 m^3 = 1000 L)

anonymous · Answer

hmmm 2?

joannablackwelder · Answer

That's what I got! Those little tanks can hold a lot of gas. :)

anonymous · Answer

woooh haha thanks :)

joannablackwelder · Answer

No problem.

joannablackwelder · Answer

Happy studies!

anonymous · Answer

Hello again maam. Can I ask another question
A sample of a volatile liquid is vaporized completely in a 240.0 cm3 flask at 99°C and 757 mm Hg.  The condensed vapor weighs 0.465 g.  
What is the molar mass of the liquid?

joannablackwelder · Answer

Looks like PV=nRT is the way to go on this one.