Thank you in advance for your help! The answers I was given before were incorrec

Question

Thank you in advance for your help! The answers I was given before were incorrect.

Part A

A balloon is floating around outside your window. The temperature outside is 27 C , and the air pressure is 0.800 atm . Your neighbor, who released the balloon, tells you that he filled it with 3.50 moles of gas. What is the volume of gas inside this balloon?

Part B

A 12.0 L gas cylinder is filled with 7.60 moles of gas. The tank is stored at 31 C . What is the pressure in the tank?

Part C

A 140 L kiln is used for vitrifying ceramics. It is currently operating at 1095 C , and the pressure is 1.000 atm . How many moles of air molecules are within the confines of the kiln?

Explanation / Answer

Part A) The pressure in the baloon is in equilibrium with the pressure outside

PV = nRT

0.8 atm X V = 3.5 moles X 0.0821 L. atm K-1 mol-1 X (273 + 31)K

therefore V = 109 L

Part B) P X 12 = 7.6 X 0.0821 X 304

therefore P = (7.6 X 0.0821 X 304)/12 = 15.8 L

Part C) 1 X 140 = n X 0.0821 X 1368

n = 1.25 moles

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