Question

If enthalpy of combustion of methane is-x kj mol-1 then heat evolved by the combustion of 8g CH4 is

Answer 1

Answer:

Correct option is

C

<ΔU

o

Reaction;

CH

4

(g)+2O

2

(g)⟶CO

2

(g)+2H

2

O(l)

Now,

Δn

g

=(n

p

−n

r

)=1−3=−2

Again,

ΔH

o

=ΔU

o

+Δn

g

RT

ΔH

o

=−X−2RT

∴ΔH

o

<ΔU

o