First slide

Numericals involving moles, molecules and atoms

Question

Which has minimum number of atoms of oxygen ?

Easy

A

10 mL H₂O (l)
B

0.1 mole of V₂O₅ (s)
C

12 gm O₃(g)
D

12.044 x 10²² molecules of CO₂

Solution

12.0214 x 10²² molecules of CO₂ = 0.2 mol
CO₂ =0.4 mol O-atoms =0.4N_A O-atoms

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