Chemistry | Enthalpy Change Calculation for N2H4 Combustion

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Joe626
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Homework Statement

hydrzine, N2H4 ia a liquid rocket feul. It reacts with oxygen to yeild nitrogen gas and water.

N2H4 (l)+ O2 (g)--> N2 (g) + 2H2O (l)

the reaction of 6.50g N2H4 evolves 126.2 kJ of heat. Calculate the enthalpy change per mole of hydrazine combusted

I am having trouble getting started on this problem. any help with how to solve this problem will be appreciated. I am having trouble with this section :/

thanks,

Joe
 
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This is just about conversion between mass and number of moles.

6.50 g of hydrazine - how many moles?