An unknown mass of Mg(s) reacts completely with excess HCl(aq)
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Problem
An unknown mass of Mg(s) reacts completely with excess HCl(aq), producing H2(g) that is transferred to a rigid 2.00 L tank at 27 °C. If the pressure of H2 in the tank is 1.20 atm, what mass of Mg was consumed?
Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)
(a) 4.74 g
(b) 2.37 g
(c) 2.17 g
(d) 3.10 g