Born haber cycle aqa Nelson thornes a2 p169 help

Hi I am not able to calulate the delta h l the enthalpy of mgcl2 on a worked example. The answer is -2524 but I keep getting another value which doesn't match the one in the eg. Can someone doing aqa a2 chen with a nelson thornes book page 169 pls help me out. By telling me the method of getting the correct value. Thank you

Check out this link:

Born Haber MgCl2

That really is a good diagram is that site accessible to all?

Do you have the Nelson Thornes A2 aqa textbook? I was referring to a specific example in my post about born haber cycles. But that site is very useful.

So thanks