Calculate the work done W by a closed system containing m= 1kg of steam, when it is compressed (a) from pA = 0.1 MPa to pB = 2.5 MPa, isothermally at T = 400C and; (b) from pA = 0.5 MPa to pB = 2.5 MPa, isothermally at T = 600C .  Use steam tables and the trapezoidal rule for integration

Five cubic meter of nitrogen are heated at constant volume so that the pressure changes from 276 kPa abs to 1375 kPa gage, For nitrogen, R= 0.296 kJ/kg-K and Cp= 1.039 kJ/kg-K. Find the transferred heat. Choices: (a. 20,515 kJ; b. 17,835kJ; c.21,066kJ; d.15,065 kJ)

PLEASE ANSWER QUICKLY WITHIN 1 HOUR THANK YOU

Edición P3. A piston-cylinder system contains 1 L of water at 105°C and 85% quality. I know adds energy, causing the plunger to travel until it makes contact with a spring of constant K = 100 N/mm, just at this moment, the volume of the water is 50% greater than the initial. The energy transfer continues until the volume is 1.7 L, and the temperature of the water reached 600°C. Make a schematic of the system according to the statement and calculate the water pressure when T = 600°C. Answer: 198.16kPa