Question

What is the concentration of a solution which contains 1 mole of CaCl2 dissolved in 2,000 milliliters of solution?

a) 0.5 M
b) 1 M
c) 1.5 M
d) 2 M

Answer 1

The concentration of the CaCl₂ solution is 0.5 M when 1 mole is dissolved in 2 liters of solution, which corresponds to option (a).

Step-by-step explanation:

The concentration of a solution is given by the formula:
C = n / V

where C is the concentration in molarity (M), n is the number of moles of solute, and V is the volume of the solution in liters.

For the given problem:

• n = 1 mole of CaCl₂
• V = 2000 milliliters = 2 liters (since 1 L = 1000 mL)

Thus, to calculate the concentration:

C = 1 mole / 2 L = 0.5 M

Therefore, the concentration of the CaCl₂ solution is 0.5 M, which corresponds to option (a).