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Use the bond energy values given below to determine the enthalpy change for the conversion of propene to propane by hydrogenation.

Answer Text:
`C_3H_6 + H_2 → C_3H_8`
Bonds broken H─H = 436
C═C = 602
+1038
Bonds formed 2C─H = 826
C─C = 346
(-1172)
ΔH = +1038 + (-1172) = -134