An ideal gas (O 2 ) has a volume of 6.1 m 3 , at a temperature of 92.1 C, and a

Question

An ideal gas (O2) has a volume of 6.1 m3, at a temperature of 92.1 C, and a pressure of 4.7 atm.

Heat flows out of the gas isochorically so that its pressure decreases to 1.3 atm. The gas then expands isobarically to a new volume 8.5 L and reaches its original temperature 92.1 C.

a) How many moles of O2 are there?

b) What is the mass in grams of O2?

c) What is the change in the internal energy of the gas?

d) How much work is done in the process?

e)   Does heat flow "in" or "out"? How much heat flows?

f) What is the pressure if the gas is heated isothermally to twice its original volume?

Explanation / Answer

a) PV = nRT

or n = PV/RT = 4.7*6.1 / 8.205736

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