A cylinder initially contains a real gas at 500 K and 1 atm

CHEMISTRY · Single correct · AP · Chemistry · Properties of Substances and Mixtures · Properties of Substances and Mixtures

Problem

A cylinder initially contains a real gas at 500 K and 1 atm. The gas is simultaneously cooled and compressed along a straight-line path on a TT–PP diagram to a final state of 250 K and 50 atm. Measurements of the compressibility factor along the path show that ZZ first falls below 1 and later rises above 1. At which point along the path does the finite molecular volume begin to dominate over intermolecular attractions in influencing ZZ? (a) 350 K and 20 atm350\ \text{K and }20\ \text{atm} (b) 250 K and 50 atm250\ \text{K and }50\ \text{atm} (c) 300 K and 35 atm300\ \text{K and }35\ \text{atm} (d) 400 K and 10 atm400\ \text{K and }10\ \text{atm}

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