Molecular Physics | Thermodynamics Answers

While the temperature remains constant at 38oC, 2.5 kg of a certain ideal gas whose Cp = 1.1724 kJ/kg-K, Cv = 0.8375 kJ/kg-K rejects 300kJ of heat. If p1 = 586kPa, find: (a) p2, (b) V1 and V2.

There are compressed isothermally 22 m3 of air measured at 27oC and 1378 kPa. If p2 = 3790 kPa, compute (a) the heat (gain or loss?), (b) the change in entropy.

Three kilograms of an ideal gas with R = 204 J/kg-K and k = 1.667 have 316 kJ of heat added during an isobaric process. The initial temperature is 38oC. Determine (a) Wnf, (b) U, (c) S.

A perfect gas with R = 320 J/kg-K and Cp = 1.6 kJ/kg-K. If 150 kJ of heat is added to 5 kg of this gas at constant pressure when t1 = 35 oC, find (a) the work nonflow, (b) U, (c)S.

An ideal gas with Cv = 1.62 kJ/kg-K and R = 273J/kg-K expands from 0.15 m3 and 27oC to 0.35 m3 during an isobaric process with p = 150kPa. Consider the process reversible nonflow, determine (a) the heat, (b) the change in internal energy, © the work nonflow, (d) the change in entropy. 

Three kilograms of neon in a constant volume system. The neon is initially at 550 kPa and 350 K. Its pressure is increased to 2000 kPa by a paddle work with 210 kJ of heat added. Find (a) the final temperature, (b) the change in internal energy, (c) the change in enthalpy, (d) the nonflow work. 

If 528 kJ of heat are added to 2.25 kg of helium at constant volume process when the initial temperature is 40oC, find (a) the final temperature, (b) the change in enthalpy, (c) the change in entropy. 

In a turbine 4500 kg/min of air expands polytropically from 425 kPa & 1360K to 101 kPa. The exponent n is equal to 1.45 for the process. Calculate the heat and work steady flow. 

A polytropic process of air from 1034 kPa, 149 oC and 0.028 m3 occurs to 138 kPa in accordance with pV1.3 = C. Determine (a) t2 in oC and V2, (b) U and H, (c) Wnf, (d) the heat from the formula using polytropic specific heat.

0.085 m3 of air are compressed isentropically from 1937 kPa and -4 oC to 5873 kPa . Find (a) t2 in oC and V2, (b) Wnf, and © H and U.