Choose the pairs having the same number of atoms.

2 g of Hydrogen and 16 g of oxygen.

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14g of Nitrogen and 16 g of oxygen.

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8 g of Helium and 2 g of hydrogen.

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16 g of oxygen and 8 g of helium.

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Solution

The correct options are
B 14g of Nitrogen and 16 g of oxygen.
C 8 g of Helium and 2 g of hydrogen.
In the given options, we have 2g of H, 14 g of N, 16 g of O and 8 g of He.

The molar masses of H, N, O and He are 1, 14, 16 and 4 respectively (in grams).

Number of moles of H = $\frac{2}{1} = 2$

Number of moles of N = $\frac{14}{14} = 1$

Number of moles of O = $\frac{16}{16} = 1$

Number of moles of He = $\frac{8}{4} = 2$

Here, 14 g of N and 16 g of O have the same number of moles. Hence, they have the same number of atoms.

Also, 2 g of H and 8 g of He have the same number of moles. Hence, they have the same number of atoms.

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