Calcium chloride is used as a Class 2 refrigerant

Question

Calcium chloride is used as a Class 2 refrigerant as a saturated solution in water that has a high heat capacity. Calcium chloride is saturated in a solution at 745 g/L at 20 degrees C. How many ions are in one liter of a saturated solution of Calcium chloride?

Options:

5.94 X 10 ^24

3.34 X 10 ^-23

1.21 X 10 ^25

4.46 X 10 ^26

4.04 X 10 ^24

1.11 X 10 ^-23

1.19 X 10 ^25

1.24 X 10 ^-21

Answer 1

745 g CaCl₂/L x 1 mole CaCl₂/110.98 g = 6.71 moles CaCl₂/liter

1 mole = 6.02x1023 molecules and ...

CaCl₂ <--> Ca²⁺ +2Cl^- so you have 3 ions for each molecule of CaCl₂

6.71 moles x 6.02x10²³ molecules/mole x 3 ions/molecule = 1.21x10²⁵ ions