Question 438: Thermodynamics & KTG

Question

A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be
the heat energy absorbed by the gas, in this process ?

Accepted Answer

At constant pressure,
W = P$$\Delta $$V = nR$$\Delta $$T
At constant pressure, heat supplied
Q = nC
p
$$\Delta $$T
$${W \over Q} = {R \over {{C_p}}}$$
For diatomic gas, C
p
= $${7 \over 2}R$$
$$ 	herefore $$ $${{10} \over Q} = {R \over {{7 \over 2}R}}$$
$$ \Rightarrow $$ Q = 10 $$ 	imes $$ $${7 \over 2}$$ = 35 J

Answer

35 J

Answer

30 J

Answer

25 J

Answer

40 J

Thermodynamics & KTG

A diatomic gas with rigid molecules does 10 J of work when expanded at constant pressure. What would be the heat energy absorbed by the gas, in this process ?

Choose the correct answer: