# The absolute mass of one molecules of a substance is 5.32 xx 10^(-23) g. What is its molecular mass ? What could this substance be ?

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The absolute mass of one molecules of a substance is 5.32 xx 10^(-23) g. What is its molecular mass ? What could this substance be ?

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The molecular mass of a substance is numerically equal to the mass of 1 mole of its molecules. Since 1 mole of molecules is equal lto 6.022 xx 10^(23) molecules, it means that the molecular mass of a substance is numerically equal to the mass of its 6.022 xx 10^(23) molecules . In this problem we have been given the absolute mass of 1 molecule of the substance, so all that we have to do is to find out the mass of its 6.022 xx 10^(23) molecules.
Now, Mass of 1 molecule of substance = 5.32 xx 10^(-23) g
So, Mass of 6.022 xx 10^(23) molecules of substance = 5.32 xx 10^(-23) xx 6.022 xx 10^(23)
= 32 g
Thus, the molecular mass of the given substance is 32 u. The substance having a molecular mass of 32 u is oxygen , having the formula O_(2).