The molar mass of H2O is 18.02 g/mol. How many moles of H20 are present in 2.15 x 10^24 molecules?

3.57moles

Explanation:

The number of moles in a compound can be got from the number of molecules it contains.

Since;

number of moles (n) = number of molecules (nA) ÷ Avagadro's number

Avagadro's number = 6.02 × 10^23 molecules

H20 contains 2.15 x 10^24 molecules, according to this question. Therefore,

n = 2.15 x 10^24 ÷ 6.02 × 10^23

n = 0.357 × 10^(24-23)

n = 0.357 × 10^1

n = 3.57moles

Hence, 3.57moles are present in in 2.15 x 10^24 molecules of H2O.

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