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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