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  4. Number of atoms of He in 100 u of He (atomic weight of He = 4u) are

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Q. Number of atoms of He in 100 u of He (atomic weight of He = 4u) are

CMC MedicalCMC Medical 2013

Solution:

$ \therefore $ $ 4u=1\,\text{He}\,\,\text{atom} $ $ 1\,u-\frac{1}{4}\text{He}\,\,\text{atom} $ $ \therefore $ $ 100\,u=\frac{1\times 100}{4}=25\,\,\text{atoms} $