112.0 mL of NO2 at STP was liquefied, the density of the liquid being 1.15 g mL−1. Calculate the number of molecules in the liquid NO2 (At. wt. N = 14)
1.1 × 1021
3.1 × 1021
2.1 × 1015
4.1 × 1021
Moles = 112/22400 = 5×10⁻³,
molecules = 3.1×10²¹.
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