2Na + H2O ⟶
⟶
2NaOH + H2

If 15.2 grams of sodium are reacted, how many liters of hydrogen gas are produced at STP (22.4 L /1 mol)?

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.

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