We arrange the coefficients in the combustion reaction in such a way that the number of atoms on the left and right is the same.
The coefficient before: carbon dioxide – 4, since butene has 4 C atoms, butene -1, water – 4, because butene has 8 H atoms, and water has 2 H atoms (8/2 = 4), oxygen – 6, because in carbon dioxide O – 8 (4 * 2) + 4 O from water.
C4H8 + 602-> 4CO2 + 4H2O.
Calculate the sum of the odds 1 + 6 + 4 + 4 = 15
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