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How many atoms are there in 100 amu of h...

How many atoms are there in 100 amu of helium , if atomic mass of helium is `4` amu ?

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Number of He atoms = `("mass of helium")/("mass of 1 atom of helium") = (100 "amu")/(4 "amu") = 25` .
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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)`

  • Compared to hydrogen the atom of helium has

    A
    More mass and is larger in size
    B
    More mass and is about the same in size
    C
    More mass and is smaller in size
    D
    None of the above

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