The internal energy change in a system that has absorbed 2 kcal of heat and done 500 ~J of work is

Step-by-step solution

Key Idea Heat given to a system ( Q ) is equal to the sum of increase in the internal energy ( u ) and the work done ( W) by the system against the surrounding and 1 cal =4.2 ~J . According to first law of thermodynamics aligned U & = Q - W & =2 4.2 1000-500 & =8400-500 & =7900 ~J aligned