Question

Sally prepares four solutions to test the effects of concentration on the vapor pressure.Concentration of SolutionsParticles in SolutionVapor Pressure2 M of ethanol solutionEthanol moleculesP11 M of NaCl solutionNa+ and Cl– ionsP21 M of MgCl2 solutionMg2+ and Cl–ionsP33 M of ethanol solutionEthanol moleculesP4Which two of these solutions would have the same vapor pressure?

Answer 1

The answer is P1 and P4- (The last option) because solute breaks down into same particles.

Step-by-step explanation:

`P_A=X_AP^o_A`
`\begin{gathered} \text{where P}_AisthevapourpressureofcomponentA,X_Amolefraction,P^0_A \\ is\text{ the vapour pressure of pure A} \end{gathered}`

Therefore PoA of ethanol component A and B will be the same.