試題詳解

5. In a hydrogenation reaction, ethene (C₂H₄) and H₂ from ethane (C₂H₆). If 137 kJ is given off per mole of C₂H₄ reacting, how much heat (kJ) is released when 12.6 g of C₂H₆ forms? (Mw(C₂H₆) = 30.07 g/mol)
(A) 57.4
(B) 28.7
(C) 14.4
(D) 0
(E) none of these