Question

Calculate the mass of 0.2 moles of water. ( Hint : Oxgyen =16 and Hydrogen = 1 )

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Answer 1

Find the molar mass first.

H2O is = 2 × 1 + 16

= 2 + 16

= 18

Mass = no . of moles × molar mass

= 0.2 mol × 18

= 3.6