Question:-
Assertion (A) : If the enthalpy of a closed system decreased by 25 kJ while the system receives 30 kJ of energy by heat transfer, the work done by the system is 55 kJ.
Reason (R) : The first law energy balance for a closed system is (notations have their usual meaning). ΔE=Q-W.
Option (A)
Both A and R are true and R is the correct explanation of A
Option (B)
Both A and R are true but R is NOT the correct explanation of A
Option(C)
A is true but R is false
Option(D)
A is false but R is true
Correct Option:
(A)
Question Solution:
E1 + Q = E2 + W
E = kE + PE + U
30 = 55 – 25
Where U is the internal energy
\ Hence validates the statement
question-answer-faq-6127