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enthalpy stuff

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spofy
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can someone explain to me why they subtracted 21 instead of adding it? i don't get what's going on

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question 3 from this paper - http://pmt.physicsandmathstutor.com/...Energetics.pdf

mark scheme - http://pmt.physicsandmathstutor.com/...etics%20MS.pdf
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spofy
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MexicanKeith
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(Original post by spofy)
helpp
The question gives you wrong data
Enthalpy of solution of LiOH is -21 KJmol^-1

They have missed the minus sign in the question!
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