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Problem 3: A sample of ideal gas is uniformly heated at constant pressure. If the amount of 180 J of heat is supplied to the gas, calculate the change in the internal energy of the gas and work done by the gas. Given that γ = 1.41.


Given    Heat given at constant pressure, ΔQp = 180 J

                γ = 1.41

Required             (i) Increase in the internal energy, ΔU

                                (ii) Work done by the ideal gas, ΔW

Formulae:    (2)  (3)

Calculation: Divide (1) by (2),


Put values of ΔQp and γ from the given data,

To calculate the work done, apply first law with this value of Δu.

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