check this website out:
www.chegg.com/homework-help/questions-and-answers/determine-sign-q-w-following-phase-change-25-c-10-atm-h2o-l-h2o-g-q41313793
3. Determine the sign of both q and w for the following phase change at 25 °C and 1.0 atm:
H2O(l) → H2O(g)
2 answers
I think Chegg charges for their help although you may be able to get a freebie.
if heat is ADDED to the system then q is +.
If work is done by the system on the surroundings then W is -.
if heat is ADDED to the system then q is +.
If work is done by the system on the surroundings then W is -.