Question

a)One reaction that produces hydrogen gas can
be represented by the unbalanced chemical
equation Mg(s) + HCl(aq) −→ MgCl2(aq) + H2(g)
What mass of HCl is consumed by the reaction of 1.69 mol
of magnesium? Answer in units of g

b)What mass of MgCl2 is produced? answer in units of g

c)what mass of H2 is produced? answer in units of g

Answer 1

Answer on Question #37663 - Chemistry - Inorganic Chemistry

Solution:

The balanced equation is

$$\mathrm{Mg}(s) + 2\mathrm{HCl}(aq) \rightarrow \mathrm{MgCl}_2(aq) + \mathrm{H}_2(g)$$

This means that 1 mole of magnesium reacts with 2 moles of HCl. So, 1.69 moles will react with $1.69 \cdot 2 = 3.38$ moles of HCl.

The mass of hydrochloric acid would be $3.38 \cdot (1.01 + 35.45) = 123$ grams.

The mass of $\mathrm{MgCl}_2$ is $1.69 \cdot (24.31 + 2 \cdot 35.45) = 161$ grams.

The mass of hydrogen is $1.69 \cdot 2 \cdot 1.008 = 3.41$ grams.