#### 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.  Option 1)  at T = 500 K, P = 40 atm, the state will be liquid. Option 2)  at T = 300 K, P = 50 atm, the state will be gas  Option 3)  at T < 300 K, P > 20 atm, the state will be gas Option 4)  at 300 K < T < 500 K, P > 50 atm, the state will be liquid.

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

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

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

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

Liquefaction of gases -

converting real gas into liquid state at high pressure and low temperature

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Option 1)

at T = 500 K, P = 40 atm, the state will be liquid.

This is incorrect.

Option 2)

at T = 300 K, P = 50 atm, the state will be gas

This is incorrect.

Option 3)

at T < 300 K, P > 20 atm, the state will be gas

This is incorrect.

Option 4)

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

This is correct.