If `1//6`, in place of `1//12`, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one one of a substance will:

Options

A. (a)Decrease twice
B. (b)Increase two folds
C. (c )Remains unchanged
D. (d)Be a function of the molecular mass of element

Answer

C

Explanation

Avogadro's number depends upon the basis of the atomic weight scale.
`:' 12 g C-=6.023xx10^(23)` atoms
`:. 6 g C=(6.023xx10^(23)xx6)/12`
`=1/2xx6.023xx10^(23)` atoms=Av. No.
Or 1 amu`=1/N=2/(6.023xx10^(23))=3.3xx10^(-24) g`
Let molar mass of an element be `M` amu
Then M amu`=Mxx3.3xx10^(-24) g`
`:. "Mass of mole"=Mxx3.3xx10^(-24)xxAv.No`.
`=Mxx3.3xx10^(-24)xx1/2xx6.023xx10^(23)=Mg`