A solution was prepared by dissolving 42.0 g of K C l in 225 g of water. Part A

Question

A solution was prepared by dissolving 42.0g of KCl in 225 g of water. Part A Calculate the mass percent of KCl in the solution. Express your answer with the appropriate units. SubmitHintsMy AnswersGive UpReview Part Try Again; 2 attempts remaining Part B Calculate the mole fraction of the ionic species KCl in the solution. Express the concentration numerically as a mole fraction in decimal form. A solution was prepared by dissolving 42.0g of KCl in 225 g of water. A solution was prepared by dissolving 42.0g of KCl in 225 g of water. Part A Calculate the mass percent of KCl in the solution. Express your answer with the appropriate units. SubmitHintsMy AnswersGive UpReview Part Try Again; 2 attempts remaining Part A Calculate the mass percent of KCl in the solution. Express your answer with the appropriate units. SubmitHintsMy AnswersGive UpReview Part Try Again; 2 attempts remaining SubmitHintsMy AnswersGive UpReview Part Try Again; 2 attempts remaining Try Again; 2 attempts remaining Try Again; 2 attempts remaining Part B Calculate the mole fraction of the ionic species KCl in the solution. Express the concentration numerically as a mole fraction in decimal form. Part B Calculate the mole fraction of the ionic species KCl in the solution. Express the concentration numerically as a mole fraction in decimal form.

Explanation / Answer

mass% = mass of solute/mass of solution

            = 42/267

            = 15.73%

mole fraction of KCl =

no. of moles of Kcl =(42/74.5) = 0.563

no.of moles of H2O = 225/18 = 12.5

mole fraction of KCl = 0.563/0.563+12.5

                                = 0.041

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