Question

Calculate the number of moles in a 90g of water.

Answer 1

Explanation:

n = m/ M

Where n : moles

m : given mass

M : molar mass

Here M of water is ( 2+16=18) = 18 g / mol

Therefore n = 90/18 = 5 moles

Answer 2

Answer:

90 g of water × Avagdro number

=). 90 g × 1.628 × 10^-19

Explanation:

So in order to calculate the number of moles of any substance present in the sample, we simply divide the given weight of the substance by its molar mass. Where 'n' is the number of moles, 'm' is the given mass and 'M' is the molar mass.

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