What volume of 20% by weight HCl solution (dense = 1.10 g / ml) is required to completely dissolve 5 g of magnesium?

univerkov | November 19, 2020 | education

Mg + 2HCl = MgCl2 + H2
n (Mg) = m / M = 5 g / 24 g / mol = 0.2 mol
n (HCl) = 2n (Mg) = 0.4 mol
m (HCl) = n x M = 0.4 mol x 36.5 g / mol = 14.6 g
m solution (HCl) = m (things) / ω = 14.6 g / 0.2 = 73 g
V solution (HCl) = m / ρ = 73 g / 1.10 g / ml = 66 l

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