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# Which of the following has maximum number of atoms?

**(a)** 18g of H_{2}O

**(b)** 18g of O_{2}

**(c)** 18g of CO_{2}

**(d)** 18g of CH_{4}

Correct Answer: (d) 18g of CH4

Explanation: Number of atoms = Mass of substance × Number of atoms in the molecule/ Molar mass × NA

18 g of water =18 x3/18 ×NA = 3 NA

18 g of oxygen = 18 x2 /32 × NA = 1.12 NA

18 g of CO_{2} = 18 x3/44 × NA = 1.23 NA

18 g of CH_{4} =18 x5 /16 × NA = 5.63 NA

**[Note: **NA = 6.023×10^{23}]

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