Question

For a real gas the P-V curve was experimentally plotted and it had the following appearance. With respect to liquifaction. Choose the correct statement.

• A. At T = 500 K, P = 40 atm, the state will be liquid.
• B. At T = 300 K, P = 50 atm, the state will be gas
• C. At T < 300 K, P > 20 atm, the state will be gas
• D. At 300 K < T < 500 K, P > 50 atm, the state will be liquid.

Answer 1

Answer: (D)

At 300 K < T < 500 K, P > 50 atm, the state will be liquid.

Answer 2

(1) at T = 500 K, P = 40 atm corresponds to 'a' substance - gas

(2) at T = 300 K, P = 50 atm corresponds to 'b' substance - liquid

(3) at T < 300 K, P > 20 atm corresponds to 'c' substance - liquid

(4) at T < 500 K, P > 50 atm corresponds to 'd' substance - liquid

So, Answer (4)