Question

an oxide of nitrogen has a molecular weight of 30. total number of electrons in one molecule of the compound is
a)15
b)30
c)45
d)60

Answer 1

Answer : The correct option is, (a) 15

Solution : Given,

Molecular weight = 30

As we know that, the molecular weight of nitrogen is 14 g/mole and the molecular weight of oxygen is 16 g/mole.

And the molecular weight of $NO$ = 14 + 16 = 30 g/mole

That means the molecular compound is, $NO$

Now we have to determine the number of electrons in $NO$ compound.

The atomic number of nitrogen and oxygen is 7 and 8 respectively.

And as we know that the atomic number is equal to the number of electrons.

The number of electrons in $NO$ compound = 7 + 8 = 15

Therefore, the total number of electrons in one molecule of the compound is, 15