Thermodynamics

posted by .

5 pounds of an ideal gas with R=38.7 and K=1.668 have 300Btu of heat added during a reversible constant pressure change of state, initial temperature=80°F.
Determine:
a.)the final temperature
b.)change of internal energy
change of enthalpy
change of entropy

• Thermodynamics -

a) Since it is a constant pressure heating, dQ = M Cp dT = [K*M*R/((K-1)]*dT

Use that to determine the temperature changle dT, and add that to 80 F.

You need to specify the units of R. They should be Btu/lbm*degF

b) dU = M Cv dT = [M/(K-1)]dT
c) dH = Cp*dT = dQ
d) dS = Integral of dQ/T
= Integral of M Cp dT/T
= M Cp ln(T2/T1)
The T's must be in degrees Rankine

Respond to this Question

 First Name School Subject Your Answer

Similar Questions

1. more physics.

What change in entropy occurs when a 27.9-g ice cube at -12 C is transformed into steam at 115 C?
2. thermodynamics

A scuba tank contains 1.5 kg. of air. The air in the tank is initially at 15 degree celcius. The tank is left near an engine exhaust line, and the tank's pressure doubles. Determine the final temperature, change of internal energy, …
3. chemistry

the pressure of 3moles of an ideal gas in a container is reduced from 1.0 atm to 0.50 atm against a constant pressure of 0.50 atm at a constant temperature of 273K..what is the change of heat (in J) for the process?
4. Thermodynamics

The initial state consists of a closed system containing one mole of super-heated liquid water at 115°C and 1 atmosphere pressure. The immediate surroundings are also at 115°C and 1 atmosphere pressure. The change in state is described …
5. Chemistry

The phrase “the heat absorbed or released by a system undergoing a physical or chemical change at constant pressure” is a. the change in enthalpy of the system. b. the change in internal energy of the system. c. the definition …
6. Thermodynamics

The initial state consists of a closed system containing one mole of water (liquid) at 85°C and 1 atmosphere pressure. The immediate surroundings are also at 85°C and 1 atmosphere pressure. The change in state is described as this …
7. Chemistry

2 moles of ideal gas at 300K, initial volume 25 L, are compressed under an external pressure at 3600 torr. Assuming the temp and the internal energy of gas do not change, what is the entropy change of the gas?
8. Physics

Suppose 2100 J of heat are added to 3.3 mol of argon gas at a constant pressure of 120 kPa. (Assume that the argon can be treated as an ideal monatomic gas.) A) Find the change in internal energy. B) Find the change in temperature …
9. chem

A sample of H2(g) expands adiabatically and reversibly from a state 1 where p1 = 200000Pa,V1 = 0.002m3 and T1 = 300K to a state 2 where V2 = 0.004m3.Assume the gas to behave as an ideal gas calculate the final temperature and its pressure.Use …
10. thermodynamics

a gas initially at 10000kPa is undergoing a reversible process in which its pressure gas doubled at a constant volume of 0.5m^3. if the total internal energy of the in kJ related to the pressure P in kPa and total volume in m^3 according …

More Similar Questions