Question

13. If 0.2 mol of the magnesium oxide is
required, how many grams of magnesium
oxide should be taken?
(1 Point)
O 20 g
8 g
11.7 g
32 g​

Answer 1

Answer:

Answer

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.