Author Question: Ethanol undergoes combustion in oxygen to produce carbon dioxide gas and liquid water. The standard ... (Read 80 times)

Labomba · **on:** Nov 5, 2023

Question 1

Ethanol (C₂H₅OH) burns according to the equation
C₂H₅OH(l) + 3O₂(g) → 2CO₂(g) + 3H₂O(l), ΔH°_rxn = –1367 kJ/mol.
How much heat is released when 35.0 g of ethanol is burned?
◦ 9.61 × 10^–4 kJ
◦ 1,040 kJ
◦ 1,367 kJ
◦ 1,797 kJ
◦ 4.78 × 10⁴ kJ

Question 2

Ethanol undergoes combustion in oxygen to produce carbon dioxide gas and liquid water. The standard heat of combustion of ethanol, C₂H₅OH(l), is –1366.8 kJ/mol. Given that ΔH°_f[CO₂(g)] = –393.5 kJ/mol and ΔH°_f[H₂O(l)] = –285.8 kJ/mol, what is the standard enthalpy of formation of ethanol?
◦ –687.6 kJ/mol
◦ –277.6 kJ/mol
◦ 687.6 kJ/mol
◦ 1,367 kJ/mol
◦ 3,010 kJ/mol

tharris7314 · **Reply #1 on:** Nov 5, 2023

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