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# Enthalpy cycle question help please (Jan 2012) Watch

1. Hi, It's the OCR Jan 2012 F322 paper, 3b)ii
http://www.ocr.org.uk/Images/78566-q...-resources.pdf

I get the basic enthalpy cycle questions, and for this question, once I know the values of the boxes I know how to get the final answer of the enthalpy change of formation. I just don't get how we find out the values of the different enthalpy changes of reactions from the table when they look so different in the table.

Thank you
2. (Original post by monica95)
Hi, It's the OCR Jan 2012 F322 paper, 3b)ii
http://www.ocr.org.uk/Images/78566-q...-resources.pdf

I get the basic enthalpy cycle questions, and for this question, once I know the values of the boxes I know how to get the final answer of the enthalpy change of formation. I just don't get how we find out the values of the different enthalpy changes of reactions from the table when they look so different in the table.

Thank you
Write out each step and remove the common terms from either side. They result will correspond to one of the equations in the boxes ...
3. (Original post by charco)
Write out each step and remove the common terms from either side. They result will correspond to one of the equations in the boxes ...
Ahh thank you very much, now I get it
4. Heyy, I'm just doing this paper in preparation for tomorrow. How did you work this question out in the end?

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