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Law of Constant Proportions

calculate the...

Question

calculate the number of molecules in 4g of oxygen.

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Solution

Mass of oxygen (O₂) = 4g

Molecular mass of oxygen = 32 g

Number of molecules of oxygen = Avogadro number x( mass of oxygen / molecular mass of oxygen)

Number of molecules = 6.023 X 10²³molecules x (4g / 32g) = 7.52X 10²²molecules

so, 7.52X 10²²molecules are present in 4g of oxygen.

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