Question

If ∆Q and ∆W represent the heat supplied to the system
and the work done on the system respectively, then the
first law of thermodynamics can be written as
(a) ∆Q = ∆U + ∆W (b) ∆Q = ∆U - ∆W
(c) ∆Q = ∆W - ∆U (d) ∆Q = –∆W - ∆U

Answer 1

Answer:

From First law of thermodynamics,

ΔU=Q+W

∵ Heat supplied to the system so Q→ Positive

and work is done on the system so W→ Positive

Hence, Q=ΔU−W