If 0.2 mol of the following substances are required how many grams of those substances should be taken?
a. Sodium chloride
b. Magnesium oxide
c. Calcium carbonate

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Solution

The formula to find out the weight of substance is,
Weight of substance (gm) = Number of moles × Molar Mass.
(i) For sodium chloride:-
Weight of sodium chloride = Number of moles × molar mass.
= 0.2 × 58.44
= 11.69 grams.
(ii) For Magnesium Oxide:
Weight of magnesium oxide = Number of moles × Molar mass.
= 0.2 × 40.3
= 8.06 grams.

(iii) For calcium carbonate:
Weight of calcium carbonate = Number of moles × Molar Mass.
= 0.2 × 100.087
= 20.02 grams.

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