Question

the number of molecules in 1 litre of water is (density of water=1g/ml)
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Answer 1

HOPE IT HELPS :

GIVEN :

Volume of water = 1 L

Density = 1 g/ml

Molecular mass of water = 18 u

SOLUTION :

Mass of water given = Density x volume

Mass = 1 g/ml x 1000 ml

Mass = 1000 g

Hence number of moles of water is :

Mole = Given mass / molecular mass

Mole = 1000 / 18 moles

Number of molecules of water = Mole x Avagadro Number

Molecules = ( 1000 / 18 ) x ( 6.022 x 10^23 )

Molecules = ( 6.022/18 ) x ( 10^26 )

Molecules = 3.345 x 10^25 molecules

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