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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

`100xx6.022xx10^(23)`

B

`50`

C

`25`

D

`100`

Text Solution

Verified by Experts

The correct Answer is:
C
Nuimber of `He` atoms
`= ("Number of atomic mass units")/("Atomic mass of" He)`
`= (100 amu)/(4 "amu atom"^(-1)) = 25 He` atoms
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Knowledge Check

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

    A
    25
    B
    100
    C
    50
    D
    `100 xx 6 xx 10^(-23)`

  • Number of atoms of He in 100 u of He ( Atomic mass of He is 4 u)

    A
    25
    B
    50
    C
    100
    D
    400

  • Assertion : Number of atoms of He in 60 u of He is 15. Reason : Atomic weight of He is 4 u.

    A
    If both Assertion & Reason are true and the reason is the correct explanation of the assertion.
    B
    If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
    C
    If Assertion is true statement but Reason is false.
    D
    If both Assertion and Reason are false statements.

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