Answer:
A. 70mL.
B. 30mL.
C. 55.02g.
Step-by-step explanation:
Data obtained from the question include:
Percentage of Isopropyl Alcohol = 70%
Density of Isopropyl Alcohol = 0.786g/mL
Percentage of the solution = 100%
A. Determination of the volume of the alcohol.
Percentage volume of solute =
volume of solute /Volume of solution x
100
70% = volume of solute/100
70/100 = volume of solute /100
Cross multiply
Volume of solute = 70/100 x 100
Volume of solute = 70mL.
Therefore, the volume of the alcohol is 70mL.
B. Determination of the volume of water.
Volume of solute (alcohol) = 70mL
Volume of solution = 100mL
Volume of water =..?
Volume of solution = volume solute + volume of water
100 = 70 + volume of water
Collect like terms
Volume of water = 100 – 70 = 30mL
Therefore, the volume of water is 30mL
C. Determination of the mass of alcohol in the solution
Density of Isopropyl Alcohol = 0.786g/mL
Volume of Isopropyl Alcohol = 70mL
Mass of Isopropyl Alcohol =.?
Density = Mass /volume
0.786 = Mass /70
Cross multiply
Mass = 0.786 x 70
Mass = 55.02g
Therefore, the mass of the alcohol used in preparing the solution is 55.02g.