Question

22.0 mg of ethanol in 4.20 * 10² ml of solution

a) 5.24 * 10⁻5 mg/ml
b) 5.24 * 10⁻2 mg/ml
c) 5.24 * 10¹ mg/ml
d) 5.24 * 10⁴ mg/ml

Answer 1

The concentration of ethanol in the solution is calculated by dividing the mass of the ethanol by the volume of the solution, which gives 5.24 * 10⁻² mg/mL, corresponding to option b).

Step-by-step explanation:

The question is asking to calculate the concentration of ethanol in a solution given the mass of ethanol and the volume of the solution. To find the concentration in mg/mL, you can use the formula:

Concentration (mg/mL) = mass of solute (mg) / volume of solution (mL)

By plugging in the values given:

Concentration = 22.0 mg / 420 mL = 5.24 * 10⁻² mg/mL

This value corresponds to option b) 5.24 * 10⁻² mg/mL.