If atomic mass of carbon was set at 100 u, what would be the value of Avogadro's number ?

Options

A. `6.02xx10^(23)`
B. `6.02xx10^(25)`
C. `5.01xx10^(24)`
D. `6.02xx10^(21)`

Answer

C

Explanation

Mass of 1 atom of Carbon `(C^(12))=(12)/(6.02xx10^(23))g`
As atomic mass of `C^(12)` is 100 u, number of atoms present in 1 g atom or 100 g is Avogadro's number on this new scale.
`:.` Avogadro's number `=(100)/(12//6.02xx10^(23))`
`=(100xx6.02xx10^(23))/(12)=5.01xx10^(24)`