Calculate the total number of molecules that will possess fractional bond order among the following molecules
$O_{2}^{2 +}, N_{2}^{2 +}, O_{2}^{+}, N O, C O, C O^{+}, O_{2}^{-}, N O^{2 +}, C N^{-}, N O^{2 -}, N_{2}^{-}$

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Calculate the number of NO2 molecules in 4 moles of a pure sample of NO2 molecules.

The correct option is B 24.088×1023We know, 1 mole of NO2=6.022×1023 NO2 molecules So, 4 moles of NO2=(6.022×1023×4) molecules =24.088×1023 NO2 molecules

Calculate the number of $N O_{2}$ molecules in 4 moles of a pure sample of $N O_{2}$ molecules.

The correct option is B $24.088 \times 10^{23}$
We know,
1 mole of $N O_{2} = 6.022 \times 10^{23} N O_{2}$ molecules

So, 4 moles of $N O_{2} = (6.022 \times 10^{23} \times 4)$ molecules $= 24.088 \times 10^{23} N O_{2}$ molecules