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.
moles of acetylene = 3 mol C2H2 (g)
ΔH°f = 227.4 kJ/1 mol C2H2 (g) (based from textbook or online)
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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