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
