Calculations involving masses

Magnesium reacts with hydrochloric acid as shown in the equation.

\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2

1.2 g of magnesium reacts completely with hydrochloric acid to form 4.75 g of magnesium chloride and 0.10 g of hydrogen.

Show, by calculation, that the law of conservation of mass applies to this reaction.

(Relative atomic masses, $A_r$ : $H=1\text{H} = 1$ ; $Mg=24\text{Mg} = 24$ ; $Cl=35.5\text{Cl} = 35.5$ )

[3]

Magnesium reacts with hydrochloric acid as shown in the equation.

\text{Mg} + 2\text{HCl} \rightarrow \text{MgCl}_2 + \text{H}_2

1.2 g of magnesium reacts completely with hydrochloric acid to form 4.75 g of magnesium chloride and 0.10 g of hydrogen.

Show, by calculation, that the law of conservation of mass applies to this reaction.

(Relative atomic masses, $A_r$ : $H=1\text{H} = 1$ ; $Mg=24\text{Mg} = 24$ ; $Cl=35.5\text{Cl} = 35.5$ )

[3]

Calculations involving masses Questions