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53 solutions

Mole Fraction

Q. The density of toluene (C7H8) is 0.867 g.mL, and the density of thiophene (C4H4S) is 0.065 g/mL. A solution is made by dissolving 8.10 g of thiophene in 270 mL of toluene. Calculate the mole fraction of thiophene in the solution.

Solved • Feb 7, 2020

Mole Fraction

Q. A 2.650x10^-2 M solution of glycerol (C3H8O3) in water is at 20.0°C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 998.9 mL. The density of water at 20.0°C is .09982 g/mL. Calculate the mole fraction of glycerol in this solution. Express the mole fraction to four significant figures.

Solved • Feb 7, 2020

Mole Fraction

Q. A solution was prepared by dissolving 31.0 g of KCl in 225 g of water. Calculate the mole fraction of the ionic species KCl in the solution. Express the concentration numerically as a mole fraction in decimal form.

Solved • Feb 7, 2020

Mole Fraction

Q. Determine the ratio of amount NaOH reacting per unit amount FeCl3. Enter an integer that represents x mol NaOH/ 1 mol FeCl3. 1.50 mol NaOH 0.50 mol FeCl3

Solved • Feb 4, 2020

Mole Fraction

Q. An aqueous solution is 0.500% by mass ammonia, NH3, and has a density of 0.996 g/mL. The mole fraction of ammonia in the solution is ________.

Solved • Feb 4, 2020

Mole Fraction

Q. An aqueous solution is 28.0 % by mass potassium bromide, KBr, and has a density of 1.24 g/mL. The mole fraction of potassium bromide in the solution is _____.

Solved • Feb 4, 2020

Mole Fraction

Q. A solution was prepared by dissolving 27.0 g of KCL in 225 g of water. Calculate the mole fraction of the ionic species KCl in the solution. Express the concentration numerically as a mole fraction in decimal form.

Solved • Jan 31, 2020