If sufficient acid is used to react completely with 21.0 grams of Mg
Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g)
what volume of hydrogen at STP would be produced?
1. 9.68 liters
2. 19.37 liters
3. 10.60 liters
4. 22.40 liters
5. 4.84 liters
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