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

How many atoms are there in 100 amu of He?

Text Solution

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We know that, 1 amu = x weight of one 12 C atom or weight of one `""^(12)C` atom = 12 amu (at. wt. of C = 12 amu). Similarly, as the atomic weight of He is 4 amu, weight of one He atom = 4 amu.
Thus, the number of atoms in 100 amu of `He = 100/4 = 25`
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