Question

How many moles are present in 4g of sodium hydroxide​

Answer 1

NaOH molecular wt = 40g

no of moles = mass /molecular mass

= 4/40

1/10

=6.22*10^23 /10

Answer 2

Given :

Mass of Sodium Hydroxide (NaOH) = 4g

To Find :

Number of moles of NaOH

Solution :

We know,

                 Number of moles = $\frac{Given Mass}{Molar Mass}$

Now, molecular mass or molar mass of NaOH = (23 + 16 + 1) = 40 g

Number of moles = $\frac{4}{40}$ = 0.1

∴ Number of moles present in 4g of Sodium Hydroxide (NaOH) is 0.1

What is a mole?

Mole is defined as the number of particles which is exactly equal to the number of $^{12}C$-atoms present in 0.012 kg of carbon.