Question

A sample of 97 g of NaCl is dissolved to make 2 L of solution. What is the molarity of the solution?
Molarity = Moles of solute/liters of solution
Hint: You need to calculate the moles from the grams given first

A. 1.66 M
B. 0.83 M
C. 48.5 M
D. 97 M

Answer 1

Answer:

Option B is the right one  0.83M

Explanation:

Molarity = Moles of solute/liters of solution

You should calculate the molar mass of NaCl firstly.

Molar mass NaCl = Molar mass Na + Molar mass Cl

Molar mass NaCl = 23 g/m + 35.45 g/m

Molar mass NaCl = 58.45 g/m

To know the moles we should divide grams / molar mass

97 g/ 58.45 g/m = 1.66 moles

This moles are in 2L of solution.

Molarity = mol/L

1.66 moles/2L = 0.83M