Question

the diagram on the left represents molecular - level particle drawings illustrating four aqueous solutions prepared from the same unknown ionic salt. each particle represents 1 mole of the solute. arrange the solutions from highest molarity to lowest molarity (most dilute). a iv, ii, iii, i b iv, iii, ii, i c iii, iv, ii, i d i, ii, iii, iv

Explanation:

Step1: Recall the formula for molarity

Molarity \(M=\frac{n}{V}\), where \(n\) is the number of moles of solute and \(V\) is the volume of the solution in liters.

Step2: Determine the number of moles and volume for each solution

• Solution I: \(n = 2\) moles, \(V=3.0L\), \(M_I=\frac{2}{3.0}\approx0.67M\)
• Solution II: \(n = 3\) moles, \(V = 1.0L\), \(M_{II}=\frac{3}{1.0}=3M\)
• Solution III: \(n = 4\) moles, \(V=4.0L\), \(M_{III}=\frac{4}{4.0} = 1M\)
• Solution IV: \(n = 6\) moles, \(V=2.0L\), \(M_{IV}=\frac{6}{2.0}=3M\)

Step3: Compare the molarities

\(M_{II}=M_{IV}>M_{III}>M_{I}\)

Answer:

B. IV, III, II, I