Question

what is the weight of 0.5 mole of H2O ?​

Answer 1

Using Unit Analysis, You begin with 0.5 Moles of H2O x 18.0 G H2O (molar mass) / 1 Mole of H2O = 9 G H2O. H (1.008 Grams = 1.0 Grams (2 atoms of Hydrogen)) + O (15.999 = 16.0 Grams) = 9.0 = 9 Grams 

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Answer 2

we know that

no. of moles = given mass/ molecular mass

mol. mass of H2O= 2 + 16 = 18 g

so you're given no. of moles and mol. mass, all you have to find is the given mass

given mass = no. of moles * molecular mass

given mass= 0.5 * 18

= 9 g