AP Chemistryhardmcq1 pt
Given ΔH°_f: CO₂ −393.5, H₂O(g) −241.8, C₂H₆ −84.7 kJ/mol. What is ΔH° for C₂H₆(g) + 7/2O₂ → 2CO₂ + 3H₂O(g)?
A.−1427.7 kJ
B.−1597.1 kJ
C.−1091.3 kJ
D.+1427.7 kJ
Explanation
Core Concept
Products: 2(−393.5) + 3(−241.8) = −1512.4. Reactants: −84.7. ΔH° = −1512.4 + 84.7 = −1427.7 kJ.
Correct Answer
A−1427.7 kJ
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