Question

A student used 0.60 g of SA (MM = 138.12 g/mol) to produce 250.0 mL of solution. What is the concentration of the SA solution?

a) 0.06 M
b) 0.024 M
c) 0.22 M
d) 0.44 M

Answer 1

The molarity of the SA solution is calculated by converting the mass of SA to moles with its molar mass, then dividing by the solution volume in liters. The calculated molarity is 0.0174 M, which does not match any of the provided options, indicating a potential error.

Step-by-step explanation:

The question is asking to calculate the molarity of an SA solution, where SA has a molar mass (MM) of 138.12 g/mol and 0.60 g of SA is used to make 250.0 mL of solution.

To find the molarity, we first convert the mass of SA to moles using its molar mass, and then divide the number of moles by the volume of the solution in liters.

Moles of SA = mass (g) / molar mass (g/mol) = 0.60 g / 138.12 g/mol = 0.004344 moles

Volume of solution in liters = 250.0 mL / 1000 = 0.2500 L

The molarity of the solution is then:
Molarity = moles / volume (L) = 0.004344 moles / 0.2500 L = 0.0174 M, which is not one of the options provided in the question.

Therefore, there must be an error in the options given or in the input data.