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# as chemistry enthalpy change calculation! watch

1. The question is: the enthalpy change of combustion for methane is -890kJmol-1 calculate the energy released when 3.2g of methane burn completely.

right so I know you need to work out the reaction first which is
CH4 +2 O2 ---> CO2 +2 H2O
but what do you do after that?

btw, Happy New Year guysss!
2. (Original post by Prista)
The question is: the enthalpy change of combustion for methane is -890kJmol-1 calculate the energy released when 3.2g of methane burn completely.

right so I know you need to work out the reaction first which is
CH4 +2 O2 ---> CO2 +2 H2O
but what do you do after that?

btw, Happy New Year guysss!
You are given the energy change PER MOLE so find out how many moles is 3.2g
3. (Original post by charco)
You are given the energy change PER MOLE so find out how many moles is 3.2g
Yeah so the number of moles = 3.2/16 = 0.2 but I don't know what to do after that :/

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4. (Original post by Prista)
Yeah so the number of moles = 3.2/16 = 0.2 but I don't know what to do after that :/

This was posted from The Student Room's iPhone/iPad App
Well, if 1 mole releases 890 kJ of energy how much energy will 0.2 moles release?

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