Problem: The hydrocarbons acetylene (C2 H2 ) and benzene (C6 H6 ) have the same empirical formula. Benzene is an "aromatic" hydrocarbon, one that is unusually stable because of its structure.Which has greater enthalpy, 3 mol of acetylene gas or 1 mol of liquid benzene?

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We’re being asked to determine which has the greater enthalpy between 3 mol of acetylene gas and 1 mol of liquid benzene


Enthalpy is a thermodynamic quantity equivalent to the total heat content of a system.


For this problem, we will calculate the enthalpy of acetylene and benzene then compare their enthalpy.


For acetylene,


We have

moles of acetylene = 3 mol C2H2 (g)

ΔH°f = 227.4 kJ/1 mol C2H2 (g) (based from textbook or online)

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Problem Details

The hydrocarbons acetylene (C2 H2 ) and benzene (C6 H6 ) have the same empirical formula. Benzene is an "aromatic" hydrocarbon, one that is unusually stable because of its structure.

Which has greater enthalpy, 3 mol of acetylene gas or 1 mol of liquid benzene?

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