40 kg of air at 345 kPa is contained in a rigid vessel at a temperature of 20'C. heat is then added until the temperature reaches 320°C. Determine a) final pressure; b) the work done; c) the heat.40 kg of air at 345 kPa is contained in a rigid vessel at a temperature of 20'C. heat is then added until the temperature reaches 320°C. 

Determine 

a) final pressure; 

b) the work done;

c) the heat.