Question

How many g of H2O are present in 0.25 mol of it a. 4.5 b. 18 c. 0.25 d. 5.4​

Answer 1

Answer: Option (a) is the correct answer.

Explanation:

It is known that number of moles is mass divided by molar mass of a substance.

Mathematically,      No. of moles = $\frac{mass}{\text{molar mass}}$

It is given that no. of moles is 0.25 mol and molar mass of water is 18 g/mol.

Therefore, calculate the mass of water as follows.

           No. of moles = $\frac{mass}{\text{molar mass}}$

                 0.25 mol = $\frac{mass}{18 g/mol}$

                     mass = 4.5 g

Thus, we can conclude that mass of water present in 0.25 mol is 4.5 g.