Question

SAQ : What is Avogadro’s number? How to determine the mass of one oxygen atom using the Avogadro number?

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Question

What is Avogadro’s number? How to determine the mass of one oxygen atom using the Avogadro number? [Ans. 2.66 × 10-23 g]

Answer

The number of molecules present in one gram molecule of a substance is called Avogadro’s number. It’s value is 6.023 × 1023.

mass of one oxygen atom = mass\ of\ one\ mole\ of\ O_2 \over Avogadro's\ number × 2

= 32 \over 6.022 × 10^{23} × 2

= 2.66 × 10-23 g

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