Find the number of moles in the following:
(i) 50 g of H2O
(ii) 7 g of Na

Number of moles in
(i) Molar mass of H2O = 18 g
Given mass of H2O = 50 g
Therefore, No. of moles in 50 g of H2O
= 50/18
= 2.78 moles.

(ii) Molar mass of Na = 23 g
Given mass of Na = 7 g
Therefore, No. of moles in 7 g of Na
= 7/23
= 0.304 moles.

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Updated on: 14-Mar-2023

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