How many grams of Ca(OH)₂ are required to produce 11.1 g of CaCl₂ with excess HCl? (Molar masses: Ca(OH)₂ = 74 g/mol, Ca
Reaction: Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O. Moles of CaCl₂ = 11.1/111 = 0.1 mol. 1 mol CaCl₂ from 1 mol Ca(OH)₂; mass = 0.1 × 74 = 7.4 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Dalton's Atomic Theory and Atomic and Molecular Masses
