Question

How many moles of n are in 0.185 g of n2o?

Answer 1

The mass of $N_{2}O$ is 0.185 g.

To calculate the number of moles first calculate the molar mass of $N_{2}O$ .

$M_{N_{2}O}=2\times M_{N}+M_{O}$

Molar mass of nitrogen and oxygen is 14 g/mol and 16 g/mol respectively

Thus, $M_{N_{2}O}=2\times 14 g/mol+18 g/mol=44 g/mol$

Now, number of moles can be calculated from mass and molar mass as follows:

$n=\frac{m}{M}=\frac{0.185 g}{44 g/mol}=0.0042 mol$

Therefore, number of moles of 0.185 g $N_{2}O$ is 0.0042 mol.

Answer 2

Answer : The number of moles of nitrogen are 0.00840 moles.

Explanation : Given,

Mass of $N_2O$ = 0.185 g

Moles of $N_2O$ = 44 g/mole

First we have to calculate the moles of $N_2O$.

$\text{ Moles of }N_2O=\frac{\text{ Mass of }N_2O}{\text{ Molar mass of }N_2O}=\frac{0.185g}{44g/mole}=0.00420moles$

Now we have to calculate the moles of nitrogen (N).

In $N_2O$, there are 2 moles of nitrogen atom and 1 mole of oxygen atom.

As, 1 mole of $N_2O$ contains 2 moles of nitrogen

So, 0.00420 mole of $N_2O$ contains 2 × 0.00420 = 0.00840 moles of nitrogen

Therefore, the number of moles of nitrogen are 0.00840 moles.