A mixture of hydrogen gas and theortical amount of air at `25^(@)` C and a total pressure of 1atm , is exploded in a closed right vessel . If the process ossurs under adiabatic conditions then using the given data anwer the question that follow :
Given :
`C_(p)(N_(2))and C_(p)(H_(2)O)"are" 8.3 and 11.3 caldeg^(-1)mol^(-1)` not necessarily in the same order.
`DeltaH_(f)[H_(2)O(g)]=-57.8kcal`
`["take air as "80% N_(2),20%O_(2)"by volume".]`
What will be the final pressure in atm?

Options

A. `~=8.5`
B. `~=7.6`
C. `~=5.46`
D. `~=0.85`

Answer

a