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Question

# Arrange in increasing order of number of atoms in 1.6 g CH4, 1.7 g NH3 and 1.8 g H2O.

A
H2O=NH3=CH4
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B
H2O<NH3<CH4
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C
CH4<NH3<H2O
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D
CH4=NH3<H2O
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Solution

## The correct option is D H2O=NH3=CH4Solution:- (A)As we know that,No. of moles(n)=Given weightMol. weightTherefore,Molecular weight of CH4=16gGiven weight of CH4=1.6g∴nCH4=1.616=0.1 moleMolecular weight of NH3=17gGiven weight of NH3=1.7g∴nNH3=1.717=0.1 moleMolecular weight of H2O=18gGiven weight of H2O=1.8g∴nH2O=1.818=0.1 moleAs we know that,No. of atoms present in a molecule = Avogadro's constant × No. of moles∵nCH4=nNH3=nH2OTherefore, No. of atoms are also equal.

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