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Number of atoms of He in 100 amu of He i...

Number of atoms of He in 100 amu of He is :

A

25

B

100

C

500

D

`100 xx 6 xx 10^(23)`

Text Solution

Verified by Experts

The correct Answer is:
A
` 1amu = 1.66 xx 10^(-24) g`
` 1 amu = 100 xx 1.66 xx 1.66 xx 10^(-24) g`
No. of atoms of a substance ` = ("Wt. of substance")/("No. of g moles") xx 6.022 xx 10^(23) xx ` Atomicity
` = (100 xx 1.66 xx 10^(-24))/(4) xx 6.022 xx 10^(23) xx 1 = 25`
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