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Science Clinic => Chemistry => Topic started by: MGLQZ on Jul 8, 2021

Title: An aqueous solution containing 12.0% MgCl2 by mass. What is the mol fraction of water in this solution?
Post by: MGLQZ on Jul 8, 2021

Question 1

An aqueous solution containing 1.0 g ephedrine in 20.0 mL solution is said to be:
◦ 5.0% ephedrine (mass/vol)
◦ 1.0% ephedrine (mass/vol)
◦ 0.50% ephedrine (mass/vol)
◦ 0.050% ephedrine (mass/vol)
◦ 20.0% ephedrine (mass/vol)

Question 2

An aqueous solution containing 12.0% MgCl₂ by mass. What is the mol fraction of water in this solution?
◦ 0.975
◦ 0.880
◦ 0.868
◦ 0.133
◦ 0.952

Title: An aqueous solution containing 12.0% MgCl2 by mass. What is the mol fraction of water in this solution?
Post by: okolip on Jul 8, 2021

Answer 1

5.0% ephedrine (mass/vol)

Answer 2

0.975