MEDIUMMCQ SINGLENEET ChemistryPhysical ChemistryMole _ Equivalent ConceptAtomic and Molecular Masses

The largest number of molecules is in

A.36 g of water✓ Correct

B.28 g of carbon monoxide

C.46 g of ethyl alcohol

D.54 g of nitrogen pentoxide.

Explanation

a) Moles of water 36 2 18 1 mole of water contains 23 6.023 10 x molecules 2 moles of water will contain 23 2 6.023 10 x x i.e. 23 12.046 10 x molecules b) Moles of CO 28 1 28 1 mole of CO contains 23 6.023 10 x molecules c) Moles of Ethyl alcohol 2 5 46 ( ) 1 46 C H OH 1 mole of 2 5 C H OH contains 23 6.023 10 x molecules d)Moles of Nitrogen pentoxide 2 5 54 1 ( ) 108 2 N O 1 2mole of 2 5 N O contains 23 3.0115 10 x molecules

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