Born- Hyber cycle below respesents the energy changes occurring as 298 K, jwhen MO(s) is formed from its elements, wherx x, y,z, a, b,c and d are enthalpy change elements, for corresponding pro0cesses respectively
`DeltaH_("sub")"of" M=180kJ//mol`
`I.E_(1)(M)=218kJ//mol`
`I.E_(2)(M)=384kJ//mol`
`DeltaH_("atomisation")"of" O_(2)=640kJ//mol`
`DeltaH(OrarrO^(-))=-142kJ//mol`
`DeltaH(OrarrO^(-2))=-844kJ//mol`
In terms of x,y,z,a,b, c and d enthalpy change for the reaction,
`2M(s)+O_(2)(g)rarr2MO(s)`,is:

Options

A. `2x+2y+2z+2a+2b+2c+2d`
B. `x+y+z+a+b+c+d`
C. `2x+2y+z+2a+2b+2c+d`
D. `2x+2y+2z+2a+2b+2c-2d`

Answer

a