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28/12/2020 5:35 pm
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Find the number of moles in the following:
(i) 50 g of H2O
(ii) 7 g of Na
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28/12/2020 5:37 pm
Number of moles in
(i) Molar mass of H2O = 18 g
Given mass of H2O = 50 g
∴ No. of moles on 50 g of H2O = 50/18 = 2.78 moles.
(ii) Molar mass of Na = 23 g
Given mass of Na = 7 g
∴ No. of moles in 7 g of Na = 7/23 = 0.304 moles.