At Westonci.ca, we make it easy to get the answers you need from a community of informed and experienced contributors. Experience the convenience of finding accurate answers to your questions from knowledgeable professionals on our platform. Experience the ease of finding precise answers to your questions from a knowledgeable community of experts.

A gas expands when 815 J of energy is added to it by heat. The expanding gas does 691 J of work on its surroundings. What is the overall change in the internal energy of the gas?