Question

if 375 J of heat are absorbed in the system and has 425 cal of work done by it, compute the change in the internal energy and interpret the sign of your result. 1 cal = 4.184J

Answer 1

Heat absorbed is positive or negative?

Answer 2

DE = Q - W
De units are in Joules
E is the energy of the system.
Q is the heat. If heat is absorbed in the system it's positive, if released then it's negative. W is work done by the system.