Question

which of the following contains the maximum number of atoms
(1)10g of CaCO3
(2)4g of hydrogen
(3)9g of NH4NO3
(4)1.8g of C6H12O6

Answer 1

3 Is containing maximum number of atoms

Answer 2

The correct option is (2) 4g of hydrogen

Number of atoms ∝n

Thus, the number of atoms is directly proportional to the number of moles.

No of moles =  Weight / Mol. Wt

Thus, the more the number of moles, the more the number of atoms.

Number of moles of 10g of CaCO3

= 10/100

= 0.1

Number of moles of 4g of H2

​= 4 / 2 = 2

Thus, 4g of H2  has the maximum number of atoms.

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