A) the change in the internal energy of a system that absorbs 2,500 j of heat and that does 7,655 j of work on the surroundings is j.

b) the δe of a system that absorbs 12.4j of heat and does 4.2 j of work on the surroundings is j.

Answers:

a) 10155 J

b) 16.6 J

Explanation:

According to the First Law of Thermodynamics we have:

Where:

is the total change in the internal energy of a system

is the heat exchanged between the system and its surroundings

is the work done on the system

a) In this case and , hence:

b) In this case and , hence:

its first and third is your answer i did the qustion the fourth isnt right