Question

Calculate number of moles 28g of He.Explain ​

Answer 1

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Answer 2

Answer:

The number of moles of He is 7 moles.

Explanation:

Given,

     mass of He = 28 g

we know that,

    atomic weight of He = 4 u

         molar mass of He = 4 g/mol.

number of moles of a substance given by,

            number of moles = given mass / molar mass

moles of He = 28g / 4gmol⁻¹ = 7 mol.

Hence the number of moles of He is 7 moles.