chemistry 1 help

Question

For the chemical reaction

how many moles of calcium chloride will be produced from  of hydrochloric acid?

Answer 1

2HCl + Ca(OH)2 ==> CaCl2 + 2H2O ... balanced equation

Use the stoichiometry of the balanced equation and dimensional analysis (unit factor analysis) to find moles of CaCl2 produced from 21.0 g of HCl.

molar mass HCl = 36.46 g/mol

21.0 g HCl x 1 mol HCl/36.46 g x 1 mol CaCl₂/2 mol HCl = 0.288 moles CaCl₂ produced (3 sig. figs.)