Answer:
The work is

The energy change of the reaction is
Explanation:
From the question we are told that
The chemical equation for this reaction is

The mass of
is 
The enthalpy
is
this also the change in energy in terms of heat
The pressure at which it is oxidized is 
The no of moles of
used in this reaction is mathematically represented as

The molar mass of
is a constant with a value 
Now substituting values


From the reaction we see that
Two mole of
reacts with One mole of
to give Four moles of 
This means that
One mole of
reacts with 0.5 mole of
to give two moles of 
it also implies that
of
reacts with
moles of
to give
moles of 
so
of
reacts with
moles of
to give
moles of 
Now the number of moles of gaseous reactant is

The number of moles of gaseous product is

So the change in number of moles for gaseous compounds is mathematically evaluated as


Now the workdone for the compound
is mathematically represented as

Where R is the gas constant with a value of 
T is the temperature with a value 
Substituting values


Generally the internal energy change of the reaction can be represented as

Substituting value

This is the internal energy change on the reaction for 42.60 g of 