Question

If 1 mol of an ideal gas at constant temperature
changes its pressure from 5 atm to 2 atm and
volume from 4 L to 10 L. then enthalpy change will
be

(1) 120 L-atm
(2)20 L-atm
(3) 100 L-atm
(4) Zero
​

Answer 1

Answer:

As we know

ΔH=ΔU+Δ(PV)

ΔH=30+(P

2

V

2

−P

1

V

1

)

ΔH=30+(20−6)

ΔH=30+14=44