chemistry AS need help question PLS

[isa2hard]

http://papers.xtremepapers.com/CIE/... AS Level/Chemistry (9701)/9701_w11_qp_21.pdf

question 3b iii)
how do i get the enthalpy value? i dont get it

pls help

 

[Immadp]

hey, its simple just divide the enthalpy change you got in part ii by the no of moles of K2CO3 you are given at the start