Physics 11.2 prac prob letter f

Question

11 J of heat are removed from a gas sample while it is being compressed by a piston that does 21 J of work.

What is the change in the thermal energy of the gas? (in J)

AND

does the temperature of gas increase or decrease?

Answer 1

Gas compression causes temperature increase....

As it's being cooled by 11J during compression which would have added 21 J to the gas, then 10J are actually added as thermal energy.

Its temperature will therefore increase..