H_(2)(g)->H_(2)(l)
a. Owork is done by the system on the surroundings
work is done by the surroundings on the system
no work is done
2SO_(2)(g)+2NO(g)->2SO_(3)(g)+N_(2)(g)
b. work is done by the system on the surroundings
work is done by the surroundings on the system
no work is done
Zn_(3)P_(2)(s)+6H_(2)O(l)->3Zn(OH)_(2)(s)+2PH_(3)(g)
c. work is done by the system on the surroundings
work is done by the surroundings on the system
no work is done
2C_(3)H_(7)OH(l)+9O_(2)(g)->6CO_(2)(g)+8H_(2)O(l)
d. work is done by the system on the surroundings
work is done by the surroundings on the system
no work is done
C(s)->C(g)
e. work is done by the system on the surroundings
work is done by the surroundings on the system
no work is done