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Number of atoms of He in 100 atoms of He...

Number of atoms of `He` in `100` atoms of `He` (at.mass 4 amu) is

A

25

B

100

C

50

D

`100xx6xx10^(-23)`

Text Solution

Verified by Experts

The correct Answer is:
A
1 amu `=1.66xx10^(-24) g`
100 amu `=100xx1.66xx10^(-24)` gm
No. of atoms of a substance
`=("Wt. of substance")/("No. of gm moles") xx6.023xx10^(23)xx`Atomicity
`=(100xx1.66xx10^(-24))/4xx6.023xx10^(23)xx1=25`.
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