Question

Assertion :Avogrado's number was proposed $6.019\times {10}^{23}$ on O-16 scale and $6.02\times {10}^{23}$ on C-12 scale. Reason: The numerical value of Avogadro's number depends upon the atomic mass scale.

Read the above assertion and reason and choose the correct option regarding it.

• A. S is correct but E is wrong
• B. S is wrong but E is correct
• C. Both S and E are correct and E is correct explanation of S
• D. Both S and E are correct but E is not correct explanation of S

Answer 1

The correct option is C Both S and E are correct and E is correct explanation of S

Avogadro's number is dimensionless. By contrast, the Avogadro constant is the amount-specific number of entities, i.e. N(S)/n(S), where N(S) is the total number of entities in a sample of a (chemically homogeneous) substance, S, and n(S) is the corresponding amount of substance. The reciprocal of this, the number-specific amount of substance, n(S)/N(S), is the amount of substance of a single entity, i.e. the entity itself. The numerical value of the Avogadro constant depends on the units used for amount of substance.
and its value is $6.019\times {10}^{23}$ on O-16 scale and $6.02\times {10}^{23}$ on C-12 scale.