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Homework answers / question archive / Situational Problem (11-13) A 1 kg of air at 250 kPa pressure and

Situational Problem (11-13) A 1 kg of air at 250 kPa pressure and...

**Situational Problem (11-13)**

A 1 kg of air at 250 kPa pressure and 100 ?C were to be expanded at constant pressure in a closed process to twice the original volume.

11. Determine the final state of air.

a. 746 b. 673 *c. 473 * d. 546

12. Determine the amount of heat.

a. 93.8 *b. 375.3* c. 750.6 d. 562.9

13. Determine the work involved in the process.

a. 428.2 b. 214.1 *c. 107.05* d. 53.53

**Situational Problem (14-15)**

A closed gaseous system undergoes a reversible process in which 153 kJ of heat are rejected and the volume changes from 0.55 m^{3 }to 0.14 m^{3}. The pressure is constant at 150 kPa.

14. Determine the work done.

a. - 41.5 b. - 71.5 c. - 51.5 *d. - 61.5*

15. Determine the change in internal energy of the system.

a. 71.5 *b. 91.5 * c. 81.5 d. 61.5

16. Steam is the working substance of a piston-cylinder assembly which initially has a specific volume of 0.09596 m^{3}/kg at 1.8 MPa undergoes a constant pressure until its final specific volume is 0.13796 m^{3}/kg. Determine the work done.

a. 80.5 kJ/kg b. 90.7 kJ/kg c. 85.4 kJ/kg *d.75.6 kJ/kg*

**Situational Problem (17-20)**

A 1.5 kg quantity of ethane ( k = 1.187 ) is cooled at constant pressure from 170 ?C to 65 ?C.

17. Determine the change of enthalpy.

*a. 276.4 * b. 254.6 c. 232.8 d. 218.2

18. Determine the change of internal energy.

a. 218.2 b. 276.8 *c. 232.8 * d. 254.6

19. Determine the heat transferred.

a. 254.6 *b. 276.4* c. 218.2 d. 232.8

20. Determine the work.

a. 86.3 b. 69.3 c. 26.6 *d. 43.6*