156 grams of calcium fluoride, caf₂, is dissolved in 2000 ml of solution. determine the molarity (m).

Explanation:

Step1: Calculate the molar mass of (CaF_2)

The molar mass of (Ca) is (40.08\space g/mol) and the molar mass of (F) is (18.998\space g/mol). For (CaF_2), (M = 40.08+2\times18.998=40.08 + 37.996=78.076\space g/mol)

Step2: Calculate the number of moles of (CaF_2)

Use the formula (n=\frac{m}{M}), where (m = 156\space g) and (M=78.076\space g/mol) (n=\frac{156}{78.076}\approx2.0\space mol)

Step3: Convert the volume of the solution to liters

Given (V = 2000\space mL), since (1\space L=1000\space mL), then (V = 2000\div1000 = 2\space L)

Step4: Calculate the molarity

Use the formula (M=\frac{n}{V}), where (n = 2.0\space mol) and (V = 2\space L) (M=\frac{2.0}{2}=1.0\space M)

Answer:

The molarity of the (CaF_2) solution is (1.0\space M)