What is the molar heat of combustion for ethanol?

[bada man]

The question i am stuck on is "If 2.9g of ethanol burn with the evolution of 87 kj of heat, what is the molar heat of combustion of ethanol?" thank you for your help if it possible you can tell me how to do this question.

 

[Borek]

2.9g ethanol - how many moles?

 

[bada man]

so basically so find how many moles of ethanol in 2.9g

So u do, 2.9g/46 (46 being the molar mass of ethanol)

 

[Borek]

87 kJ for 2.9/46 moles, how much for 1 mole?