Enthalpy change question

This question is supposed to be easy but my mind has gone blank!!!

I need help on question twos of part 1&2.

What do you do after MCAT??

You have the formula written on the left, just plug and chug.

You have the formula written on the left, just plug and chug.

Is it the correct formula? I don't get the logic behind it, could you explain?

What if the question was 0.5 moles or 2 moles?

That's why you divide by the number of moles - to get the MOLAR heat.

Division by 1000 is just to convert J to kJ.

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Edexcel A-Level Economics Paper 1 - Unofficial Mark Scheme - 18 May 2023