A gas under constant pressure of `4.5 xx 10^(5) Pa` when subjected to `800 kJ` of heat, changes the volume from `0.5 m^(3) to 2.0 m^(3)`. The change in internal energy of the gas is
A. `6.75xx10^(5) J`
B. `2.25xx10^(5) J`
C. `3.25xx10^(5) J`
D. `1.25xx10^(5) J`

A gas under constant pressure of `4.5 xx 10^(5) Pa` when subjected to `800 kJ` of heat, changes the volume from `0.5 m^(3) to 2.0 m^(3)`. The change in internal energy of the gas is
A. `6.75xx10^5 J`
B. `5.25xx10^5 J`
C. `3.25xx10^5 J`
D. `1.25xx10^5 J`