In a reaction of a potential new fuel, it is found that when 2.29 moles of the f
ID: 853408 • Letter: I
Question
In a reaction of a potential new fuel, it is found that when 2.29 moles of the fuel combusts, 1,779 kJ of energy is released. What is the delta Hrxn for the combustion of the fuel in units of kJ/mol.
A reaction in aqueous solution is run in a calorimeter and it is found that the the solution gains 96 kJ of heat and the calorimeter gains 9 kJ of heat. What is the heat gained or lost by the reaction (qrxn) in kJ?
The ? Hrxn for the reaction A + B ? C is 17 kJ.
What is ?Hrxn for the reaction 4A + 4B ? 4C in kJ?
The ? Hrxn for the reaction A + B ? C is 17 kJ.
What is ?Hrxn for the reaction 4C -? 4A + 4B in kJ?
Explanation / Answer
2.29 MOLESOF FUEL RELEASES--------------------------------------1779KJ
1 MOLE OF FUEL RELEASES----------------------------------------?
=1779/2.29
=776.85KJ/MOLE
HEAT GAINED BY THE REACTION MIXTURE= HEAT GAINED BY THE SOLUTION+HEAT GAINED BY CALORIMETER
=96+6
=102KJ.MOLE
A + B -----------------> C DH= 17 kJ.
4A +4B--------------->4C:DH=4*17=68KJ
A + B ----------------> C :DH= 17 kJ
C------------------------->A+B :DH=-17KJ
4C------------------------->4A+4B :DH=4*(-17)=-68KJ
=
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