Asample of seawater contains 78.0 grams of nacl in 2,025 ml of solution. if the molar mass of nacl is 58.443 g/mol, what is the molarity of this sample?

Explanation:

Molarity is defined as number of moles per liter of solution.

Mathematically,        Molarity =

Also, it is known that no. of moles equal mass divided by molar mass. Since, it is given that 2,025 mL equals 2.025 L, mass is 78.0 g, and molar mass is 58.443 g/mol.

Therefore,     No. of moles =

                                            =

                                            = 1.33 mol

Hence, calculate the molarity as follows.

                 Molarity =

                                =

                                = 0.656 mol/L

Thus, we can conclude that molarity of the given sample is 0.656 mol/L.