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  4. The number of atoms in 4.25 g of NH3 is approximately

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Q. The number of atoms in $4.25 \,g $ of $NH_3$ is approximately

AIPMTAIPMT 1999Some Basic Concepts of Chemistry

Solution:

Molar mass $=14+3=17$
No.of moles $=\frac{4.25}{17}=0.25$ moles
1 mole $=4 \times 6.022 \times 10^{27}$ atoms
$0.25 mole =.25 \times 4 \times 6.022 \times 10^{23}=6.022 \times 10^{23}$ atoms