Question

How many moles of h2o is present in 180g of water molecules?

Answer 1

molecular mass of H20 = 18 g
18 g of water= 1mol
1 g = 1/18 mol
180 g= 180×1/18= 10 mol

Answer 2

Solution :

we need to find out number of moles present in 180g of water molecules.

we know that,

n = Given mass/molar mass

where,

• n = number of moles

Molar mass of water H2O :

= 1 × 2 + 16

= 18 g

number of moles :

= 180g/18g

= 10 mol

Hence

• Number of moles present in 180g of water molecules is 10mol

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