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Homework Statement
The temperature of an ideal gas (M=28kg/mole) has increased 14K by adding 29J of heat at a constant pressure. To cool the gas back to the initaial temperature 20.7J of heat is extracted from the gas at a constant volume. Find the mass of the gas.
Homework Equations
ΔU=(3/2)nRΔT
n=number of moles
R=8.31
T=temperature
The Attempt at a Solution
none