Question

5.
The difference between AH and AU for the combustion of toluene (C7H8) at 300 K is
1)-2 RT
2) 4 RT
3) +2 RT
4) +4 RT​

Answer 1

Answer:

-2RT

Explanation:

GIVEN BALANCED EQUATION-

C7H8+9O2(g)=7CO2(g)+4H2O

FROM THIS EQUATION WE GET ∆n=(7-9)

=-2

we know--- ∆H=∆U+∆nRT

FROM HERE ∆nrt=∆H-∆U

=-2RT