Question

Find out the mass of 4.5 moles of the following compounds: (i)Water (H20) (ii) Sodium Carbonate (Na2CO3) Atomic masses: (Na=23, C=12, H=1.0-16) ​

Answer 1

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(i) Water (H2O) —

We know ,

• G.M.M. of H2O = 2×1g + 16g = 18g

→ Mass of 1mole water = 18g

∴ Mass of 4.5mole water = 18g×4 = 81g

(ii) Sodium carbonate (Na2CO3) —

We know ,

• G.M.M. of Na2CO3 = 2 × 23g + 12g + 3× 16g =46g + 12 + 48 = 106g

→ Mass of 1mole Na2CO3 = 106g

∴ Mass of 4.5mole Na2CO3 = 4.5 × 106g = 477g

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