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Question

The number of atoms in 62 g of phosphorous if its gram atomic mass is 31 g is .

A
2×1023
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B
3.01×1023
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C
1.204×1024
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D
1.50×1021
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Solution

The correct option is C 1.204×1024
Given, mass of phosphorus = 62 g
The gram atomic mass (GAM) of phosphorus = 31 g
Also, 1 mole = 6.023×1023 particles
Number of moles = 6231 = 2 moles
The number of atoms present in 62 grams of phosphorous = 2×NA
= 12.04×1023=1.204×1024 atoms.

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