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AS chemistry questions

Can anyone help me on these two questions?

calculate the standard enthalpies of combustion of hexane given that combustion of 1.720g of hexane released 84.06kJ.

0.200 moles of cyclohexane C6H12 (l) can release 784KJ when it is burnt.
Write an equation for the reaction that represents the enthalpy of combustion of cyclohexane.

Thank you!
Original post by rm_27
Can anyone help me on these two questions?

calculate the standard enthalpies of combustion of hexane given that combustion of 1.720g of hexane released 84.06kJ.

0.200 moles of cyclohexane C6H12 (l) can release 784KJ when it is burnt.
Write an equation for the reaction that represents the enthalpy of combustion of cyclohexane.

Thank you!


1. you know the mass burnt, now convert to moles ...
and scale up for 1 mol.
Reply 2
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rm_27
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Original post by charco
1. you know the mass burnt, now convert to moles ...
and scale up for 1 mol.



Yup I worked that out already, it came up as 0.01 moles. Don't know what to do next?
Original post by rm_27
Yup I worked that out already, it came up as 0.01 moles. Don't know what to do next?


so if x kJ is releases by 0.01 mol how much is released by 1 mol?
Reply 4
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GDN
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how do you get 0.01 mol using n=m/Mr ?
Reply 5
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rm_27
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Original post by GDN
how do you get 0.01 mol using n=m/Mr ?


0.02! Typo, sorry.

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