The enthalpy of solution , sodium and sodium oxide in large volume of water , are -18KJ/mole and -238KJ/mol, respectively . If the enthalpy of formation of water is -286 KJ/mol, then what is the enthalpy of formation of sodium oxide ? All the enthalpies are at 298K and 1 bar pressure.
[Given : reaction involved are
`2Na(s)+2H_(2)O(l)to 2NaOH(aq)+H_(2)(g)`
` Na_(2)O(s)+H_(2)O(l)to2NaOH(aq)`
A. `+54KJ//mol`
B. `-130KJ//mol`
C. `-416KJ//mol`
D. `+156KJ//Mol`
