Answer:
1519.5 joules
Explanation:
What is the change in internal energy (in J) of a system that releases 675 J of thermal energy to its surroundings and has 525 cal of work done on it
first, convert cal to joules
1 cal =4.18 joules
so 525 cal = 525 X 4.18 = 2194.5 joules
the system spent 675 joules heating the surroundings and was given
2194.5 joules by work done on it
so the net gain in energy is
2194.5 -675 = 1519.5 joules
