Find the molarity of 4025 mL solution, which contains 7.85 g of CaF2.

0.025M

Explanation:

Molarity (M) = number of moles (n) ÷ volume (v)

To find the mole of CaF2, we need to find its molar mass:

Ca= 40g/mol, F=19g/mol

CaF2 = 40 + 19 (2)

40 + 38

= 78g/mol.

Using; mole = mass/molar mass

mole = 7.85/78

mole = 0.1006

mole = 0.101mol

Molarity (M) = number of moles (n) ÷ volume (v)

Volume in Litres = 4025mL/1000

= 4.025L

Molarity (M) = 0.101/4.025

Molarity = 0.025M

the answer to this question is 3.