Question 585: Thermodynamics & KTG

Question

At a certain temperature, the degrees of freedom per molecule for gas is 8. The gas performs 150 J of work when it expands under constant pressure. The amount of heat absorbed by the gas will be _________ J.

Accepted Answer

$$f = 8$$
$$W = P\,dV = 150$$
$$Q = W + \Delta U$$
$$ = P\,dV + {f \over 2}\,PdV$$
$$Q = 5 	imes 150 = 750\,J$$

Thermodynamics & KTG

At a certain temperature, the degrees of freedom per molecule for gas is 8. The gas performs 150 J of work when it expands under constant pressure. The amount of heat absorbed by the gas will be _________ J.

Choose the correct answer: