13. A total of 198 J of work is done on a gaseous refrigerant as it undergoes compression. The internal energy of the gas increases by 121 J during the process. Calculate the total amount of energy transferred
as heat to the environment.

Assume you measured the mass of the cart to be (500 ± 1) g and the mass of the additional mass you put on the cart to be (500 ± 1) g as well. since the scale you are using in the lab cannot measure objects heavier than 600g you will have to sum up individual pieces and propagate the error. so what would be the mass and the standard error of the cart and the mass