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Question

The "heat of total cracking" of hydrocarbons ΔHTC is defined as ΔH at 298.15 K and 101.325 kPa for the process below:
CnHm+(2nm2)H2(g)nCH4(g)
Given that, ΔHTC is 65.2 kJ for C2H6 and 87.4 kJ for C3H8, calculate ΔH for
CH4(g)+C3H8(g)2C2H6(g)

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