Q.

Which of the following pairs has/have the same number of atoms?

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a

16 g of O2(g) and 4 g of H2(g)

b

16 g of O2 and 44 g of CO2

c

28 g of N2 and 32 g of O2

d

12 g of C(s) and 23 g of Na(s)

answer is C.

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Detailed Solution

(c) Number of atoms in 28 g of N2=2828×NA×2=2NA (where, NA= Avogadro number)  Number of atoms in 32 g of O2=3232×NA×2=2NA (d) 12 g of C(s) contains atoms =1212×NA×1=NA Number of atoms in 23 g of Na(s)=2323×NA×1=NA
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Which of the following pairs has/have the same number of atoms?