Question

DIARY ENTRY: (English)
You are Yourself. You happened to be in a location where you are unable to the classes and you lost marks because of that in the exam. Record you're experience in 100-150 words in your diary.


Please help me with this ​

Answer 1

Answer:

ANSWER

The heat of reaction is basically ΔH at constant pressure and is ΔU at constant volume.

Since, for any reaction the relation between this heats is given by equation,

ΔH = ΔU + (Δn

g

)RT

where, Δn

g

= change in number of gaseous moles in any reaction.

Since, in the above reaction the only gaseous species are CO

2

and O

2

, so,

Δn

g

=12−15=−3.

Hence, using ΔH - ΔU = (Δn

g

)RT

ΔH - ΔU =(−3)RT=(−3)×8.314×298.15J (T in Kelvin)

=> ΔH - ΔU=7430J=7.43KJ

Hence, answer is option C.