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Reaction: Na₂CO₃ + 2 HCl → 2 NaCl + CO₂ + H₂O. Moles of NaCl = 8.4/58.5 ≈ 0.1436 mol. 2 mol NaCl from 1 mol Na₂CO₃; 0.1436 mol from 0.0718 mol. Mass = 0.0718 × 106 ≈ 7.61 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Reactions in Solutions and Mass Percentage and Numericals
Reaction: Na₂CO₃ + 2 HCl → 2 NaCl + CO₂ + H₂O. Moles of Na₂CO₃ = 10.6/106 = 0.1 mol. 1 mol Na₂CO₃ produces 2 mol NaCl; 0.1 mol produces 0.2 mol. Mass = 0.2 × 58.5 = 11.7 g.
Ref: NCERT Class 11 Chemistry > Chapter 1: Some Basic Concepts of Chemistry > Topic: Dalton's Atomic Theory and Atomic and Molecular Masses
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