Question

When a system is taken from state `A` to state `B` along path `ACB` as shown in figure below, `80 J` of heat flows into the system and the system does `30 J` of work.

How much heat flows into the system along path `ADB` if the work done by the system is `10 J`:
A. `40 J`
B. `60 J`
C. `80 J`
D. `100 J`

Answer 1

Correct Answer - B
Since `Delta E= q+w=80-30=50`
So for `ADB`
`Delta E=q+w , 50=q-10, q=60J`