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Hydrogen gas is produced when we react magnesium
metal with hydrochloric acid:
Mg(s) + 2 HCl(aq) → MgCl₂(aq) + H₂(g) T
(a) If 4.50 g of hydrogen gas is collected at STP, what
volume of hydrogen does this represent?
(b) If 0.52 mol of magnesium completely reacted, what
amount of hydrogen gas (in moles) would be produced
at STP? How many grams of hydrogen is this?



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