Question

what is the mass of 6.80 moles h2o

Answer 1

6.80mol x (18.02g/1mol) = 122.5g

You multiply the 6.80mol of H2O w/ the molar mass of water to find the mass.
The moles will cancel out with each other, resulting in the mass (g).

Answer 2

Explanation:

Number of moles is defined as mass divided by molar mass.

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

It is given that there are 6.80 moles and it is known that molar mass of water is 18 g/mol.

Therefore, calculate mass as follows.

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

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

                            mass = 122.4 g

Thus, we can conclude that mass of 6.80 moles $H_{2}O$ is 122.4 g.