REFRESHER DAY 1 - PART 1

Question 1

A solution with 8.5% acetone and 91.5% water by mass has a density of 0.9867g/mL. What mass of acetone is present in 7.5L of the solution?

a. 0.424kg
b. 0.629kg
c. 1.041kg
d. 0.085kg

Answer 1

b. 0.629kg

Question 2

In normal blood, there are about 5.4x109 red blood cells per mL. The volume of a red blood cell is about 90x10-12cm3, and its density is
1.096g/mL. How many liters of whole blood would be needed to collect 0.5kg of red blood cells?

a. 1.1L
b. 0.9L
c. 0.6L
d. 2.1L

Answer 2

b. 0.9L

Question 3

An empty 3L bottle weighs 1.7kg. Filled with a certain wine, it weighs 4.72kg. The wine contains 11.5% ethyl alcohol by mass. How many grams of ethyl alcohol are there in 250mL of this wine?

a. 28.9g
b. 38.2g
c. 11.5g
d. 18.7g

Answer 3

a. 28.9g

Question 4

An aqueous solution that is 5.3% LiBr by mass has a density of 1.04g/mL. What is the molarity of this solution?

a. 0.563M
b. 0.634M
c. 0.0633M
d. 0.0563M

Answer 4

b. 0.634M