(a) We are given 5.00 g of methane. The molar mass of methane is 12.01 g/mol (for carbon) + 4 * 1.01 g/mol (for hydrogen) = 16.05 g/mol. So, the moles of methane are:
moles = (5.00 g) / (16.05 g/mol) = 0.3115 mol
Now, we can find the enthalpy change for this
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