Question

$71g$ of chlorine gas is allowed to expand freely into vacuum Calculate w.q $DeltaU$ and $DeltaH$ .

Answer 1

$P(ex) =0, w =- P(ex) (V(2)-V(1)) =- 0 (V(2)-V(1)) = 0$
As tempertaure is not given assume it as constant.
$:. DeltaU = 0, DeltaU =q +w, q =0$
$0 =q+0 DeltaH = 0$