The heat of combustion for #n#-heptane, #C_7H_16#is 4,817 kJ/mol. How much heat is released if 550 kg of this liquid burns completely?

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Answer 1 · 2017-06-16T06:10:32

Approx. #-2.7xx10^8*kJ#

We interrogate the combustion reaction of heptane.......

#C_7H_16(l)+11O_2(g) rarr 7CO_2(g) + 8H_2O(g)#

#DeltaH^@=-4817*kJ*mol^-1#, i.e. #DeltaH^@# is quoted per MOLE of REACTION as written..........

#"Moles of heptane combusted"=(550*kgxx10^3*g*kg^-1)/(100.21*g*mol^-1)#

#5488.5*mol#.

And thus #DeltaH_"rxn"^@=5488.5*cancel(mol)xx-4817*kJ*cancel(mol^-1)#

#=-2.64xx10^8*kJ#