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26 January, 17:26

Write the balanced equation for the decomposition of hydrogen peroxide to form water and oxygen.

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  1. 26 January, 20:29
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    Hydrogen peroxide is H2O2, while water is H2O and oxygen (a diatomic gas) is O2. The (unbalanced) reaction is:

    H2O2 - - > H2O + O2

    Notice that the H2O2 has 2 H atoms, and so does H2. This means that both must have the same coefficients, and we can adjust the coefficient of O2. Since H2O2 has 2 O atoms, and H2O has 1, we multiply O2 by 1/2:

    H2O2 - - > H2O + (1/2) O2

    This has an equivalent number of H and O atoms on either side, but we want the coefficients to be whole numbers, so we multiply everything by 2:

    2H2O2 - - > 2H2O + O2
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