Chemistry (M.Phil./Ph.D.) 2015 Panjab University Entrance Exam With Answers

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19.

Use the following data to calculate the molar enthalpy of combustion of ethane C2H6.

2C2H2(g) + 5O2 (g) → 4 Co2(g)+2H2O(I) ΔH= -2511 KJ/mol
C2H2(g) + 2H2(g)→C2H6(g) ΔH= -311 KJ/mol
2H2(g)+O2(g)→2H2O(g) ΔH = -484 KJ/mol
A: -1428 KJ/mol
B: -2684 KJ/mol
C: -2856 KJ/mol
D: -3306 KJ/mol

The answer is: A

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