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Alkali metals are so reactive that they react directly with water in the absence of acid. For Example...
2 K(s) + 2 H2O(l) ¨ 2 K+(aq) + 2 OH− (aq) + H2(g).

How many milliliters of hydrogen will be evolved over water when 4.52 g K reacts with an excess of. H2O (l)?

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