High School

Calculate the molarity of 1.60 L of a solution containing 1.55 g of dissolved KBr.

a. 0.032 M
b. 0.065 M
c. 0.097 M
d. 0.120 M

Answer :

Final answer:

To calculate the molarity of a solution, divide the moles of solute by the liters of solution. In this case, the molarity is approximately 0.008125 M.

Explanation:

To calculate the molarity of a solution, we need to use the formula:

Molarity (M) = moles of solute / liters of solution

In this case, we have 1.55 g of KBr dissolved in 1.60 L of solution. First, we need to convert the mass of KBr to moles using its molar mass. The molar mass of KBr is 119 g/mol. So,

moles of KBr = 1.55 g / 119 g/mol = 0.013 moles

Now, we can calculate the molarity:

Molarity = 0.013 moles / 1.60 L = 0.008125 M

Therefore, the molarity of the solution is approximately 0.008125 M. So, the correct answer is 0.008 M.