Chemistry - Thermodynamics - I Question with Solution | TestHub

During compression of a spring the work done is$10\mathrm{ }\mathrm{k}\mathrm{J}$and$2\mathrm{ }\mathrm{k}\mathrm{J}$escaped to the surroundings as heat. The change in internal energy,$\mathrm{\Delta }\mathrm{U}\left(\mathrm{i}\mathrm{n}\mathrm{k}\mathrm{J}\right)$is: