Explanation:
Number of moles is defined as mass divided by molar mass.
Mathematically, No. of moles = [tex]\frac{mass}{molar mass}[/tex]
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 = [tex]\frac{mass}{molar mass}[/tex]
6.80 mol = [tex]\frac{mass}{18 g/mol}[/tex]
mass = 122.4 g
Thus, we can conclude that mass of 6.80 moles [tex]H_{2}O[/tex] is 122.4 g.
