How many moles of calcium chloride will be produced from 22.9 g of hydrochloric acid?

0.314 moles

We are given;

We are required to determine the number of moles of CaCl₂

2HCl + Ca(OH)₂→ CaCl₂ + 2H₂O

Moles = Mass ÷ Molar mass

Molar mass = 36.46 g/mol

Moles of HCl = 22.9 g ÷ 36.46 g/mol

                     = 0.628 moles

From the equation 2 moles of HCl reacts to produce 1 mole of CaCl₂

Thus, moles of CaCl₂ = Moles of HCl ×  1/2

                                   = 0.628 moles × 1/2

                                   = 0.314 moles

Thus, the number of moles of CaCl₂ is 0.314 moles