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Enthalpy change question

Hi, I'm a bit stuck on this questions so any help would be appreciated :smile:

H2 + 0.5O2 -> H2O

delta H for the reaction above is -286kj/mol. What mass of oxygen must be consumed to produce 1144 kj of energy?

thanks :smile:
If

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Hippysnake
If

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ooh thanks for that! :biggrin: much easier than I thought :smile:
<liverpoolfc>
ooh thanks for that! :biggrin: much easier than I thought :smile:


Actually the other answer was a little incorrect.
most of the working was right though, but
it would be 64g as its 2moles of O2 you need. not 2 moles of O
1mole O2=32g so 2moles of O2=64g
me and my bf were working it out and got his flatmate( who has a chemistry degree) to check it. :wink:
Ah yeah, balls, I don't normally make that mistake on pen and paper, just on forums where I can't write 'O2' or 'H2O' properly. Screw latex...

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