Question

hydrogen gas can be produced in the laboratory through the reaction of magnesium metal with hydrochloric acid: mg(s)+2hcl(aq)→mgcl2(aq)+h2(g) when 21.0g of mg reacts, what volume, in liters, of h2 gas is produced at 20∘c and 760 mmhg ?

Answers

bobpursley
Look at the balanced equation. for each mole of Mg consumed, two moles of H2 gas are produced. So the question is, how many moles of Mg was used: 21g/atomicmassMg

Now, twice that is the moles of H2 gas.
Volume?

V=nRT/P use the correct R for your units.

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