Here, we are required to give the balanced chemical equation (including phases) that describes the combustion of Butene, C4H8(g).
The balanced chemical equation is;
C4H8(g) + 6O2(g) -----------> 4CO2(g) + 4H2O(g).
Generally, Alkanes and Alkenes with general formular CxH(2x+2) and CxH2x respectively undergo combustion in Oxygen to yield Carbon dioxide, CO2 and Water, H2O.
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