In the interaction of calcium with water formed calcium hydroxide in an amount of 0.3 mol. How much hydrogen was released?

We compose the reaction equation:
Ca + 2H2O = Ca (OH) 2 + H2
Calculate the amount of hydrogen substance H2 = 0.3 mol (equal to the amount of calcium hydroxide substance)
Calculate the volume of hydrogen V (H2) = 0.3 mol * 22.4 l / mol = 6.72 l.

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