Question

Write the balanced equation for the reaction between hydrochloric acid and magnesium. What mass of the magnesium product is formed when 133.77 g of hydrochloric acid reacts? Show work. Include Molar Mass Values and Dimensional Analysis.

Answer 1

Mg + 2HCl --> MgCl₂ + H₂

Molar masses:

$M(HCl)=35.453+1.008=36.461g/mol$

$M(MgCl_2)=24.305+2\times35.453=95.211g/mol$

Mass of MgCl₂:

$m(MgCl_2)=133.77g(HCl)\times\frac{1mol(HCl)}{36.461g(HCl)}\times\frac{1mol(MgCl_2)}{2mol(HCl)}\times\frac{95.211g(MgCl_2)}{1mol(MgCl_2)}=174.66g$

Answer: 174.66 g