Hess’s Law. (Question 6.58)
Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 (-2341 kJ.mol), C4H8 (-2755 kJ/mol), and H2 (-286 kJ/mol), calculate ΔH for the reaction
C4H4(g) + 2H2(g) C4H8(g) ΔH =_______kJ
Answer:
you do products-reactants, but remember to multiply the # of mols in the equation
[ (1 mol C4H8)(-2755 kj/mol)] - [(1 mol C4H4)(-2341 kj/mol) + (2 mol H2)(-286 kj/mol)]
this reduces to:
[-2755] - [-2341 + -572]
[-2755] - [-2913]=
158 kJ
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