Question 21
An oxide of nitrogen has molecular weight 30. The total number of electrons, in a sample containing three molecules of the oxide would be (assuming that nitrogen and oxygen are present in their most stable isotopic state)
Solution
With N = 14 and O = 16, the oxide of molecular weight 30 is NO. One NO molecule has $$7 + 8 = 15$$ electrons, so three molecules contain $$3 \times 15 = 45$$ electrons.
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