10 g of dry ice (solid CO_2) is placed in a 2.0×10^4 cm^3 container, then all th

Question

10 g of dry ice (solid CO_2) is placed in a 2.0×10^4 cm^3 container, then all the air is quickly pumped out and the container sealed. The container is warmed to 0 C, a temperature at which CO_2 is a gas.

A)What is the gas pressure? Give your answer in atm. The gas then undergoes an isothermal compression until the pressure is 3.1 atm, immediately followed by an isobaric compression until the volume is 2000 cm^3.
Express your answer using two significant figures.

B)What is the final temperature of the gas? (In Celsius)

Explanation / Answer

P = nRT / V Molar mass of CO is 28.010 g mol^-1. Therefore number of moles in 20 g is 20 g/28.010 g mol^-1 = 0.71 mol. P = ((.71)(8.314472e15)(-273.15)) / (2.0*10^4 cm^3) P = -8.062398*10^19 m^3

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