MEDIUMMCQ SINGLEJEE Advanced ChemistryPhysical ChemistryMole _ Equivalent ConceptAtomic and Molecular Masses

The number of molecules in 4.25 g of ammonia is about

A.1.0 × 1023

B.1.5 × 1023✓ Correct

C.2.0 × 1023

D.2.5 × 1023

Explanation

Moles of 3 ( ) 4.25 0.25 . . 17 Weight g NH Mol wt 1 mole of 3 NH contains 23 6.023 10 x molecules 0.25 mole of 3 NH will contain 23 0.25 6.023 10 x x i.e. 23 1.5 10 x molecules The correct option is (b)

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