Water gas, a mixture of h2 and co2, is a fuel made by reacting steam with red-hot coke (a by product of coal distillation):

elements

explanation:

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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.