How many grams of H2O are present in 0.2 mole of it?
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How many grams of Al are present in 0.2 mole of it?
How many grams of HCl are present in 0.1 mole of it?
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The mass of 5.6 litres of a certain gas at S.T.P. is 12 g. What is the relative molecular mass or molar mass of the gas?