Calcuate the lattice enthalpy of $m(s)$ crystal. Hydration entholpies: M$=-276$kj$/$mol $,$ X$=-363$kj$/$mol$,$ MX$($s$)=89$ kj$/$mol

a$)-452k$J$/$mol

b$)550kJ/$mol

c$)639k$J$/$mol

d$)728$ kj$/$mol

e$)365kJ/$mol