Consider the reaction, C2H4 (g) + H2 (g)- C2H6 (g) where -137kJ of heat is released.
How many kilojoules are released when 55.3g of C2H4 reacts?

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  1. 137 kJ heat released for 28 g C2H4. You have 55.3g; therefore, heat released will be 137 kJ x (55.3/28) = ??
    Another way to look at it.
    This is 137 kJ heat released per mol C2H4.How many moles do you have?
    That is 55.3/28 = 1.975 moles
    Then 1.37 kJ/mol x 1.975 mol = ??

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  2. 480kj

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  3. 270. kJ are released.

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