Fundamentals of General, Organic, and Biological Chemistry 8th edition by John E. McMurry test bank

Global LO:  G4
 
125) Gasoline has a density of about 0.65 g/mL.  How much does 34.0 L weigh in pounds?
Answer:  Convert 34.0 L to mL then multiply by the density to obtain the grams.
Convert grams to pounds:  34,000 mL × 0.65 g/mL × 1 lb/454 g = 48.7 lbs.
Diff: 2
Section:  1.12
LO:  1.13
Global LO:  G4
 
126) A gas at 25°C exactly fills a container previously determined to have a volume of 1.05 × 103 cm3. The container plus gas are weighed and found to have a mass of 837.6 g. The container, when emptied of all gas, has a mass of 836.2 g. What is the density of the gas at 25°C?
Answer:  1.3 × 10-3 g/cm3
Diff: 2
Section:  1.12
LO:  1.13
Global LO:  G4

127) Which of the following statements is true of specific gravity?
A) It has the units of g/cm3.
B) Specific gravity is constant at any temperature.
C) Specific gravity is unitless because it is the density of one substance divided by the density of water.
D) Specific gravity is a measure of the reactivity index of a substance.
Answer:  C
Diff: 2
Section:  1.12
LO:  1.13
Global LO:  G4
 
128) Explain how density can be used to determine the volume of carbon tetrachloride (which is a liquid at room temperature) needed to make a mixture using 37.2 of carbon tetrachloride.
Answer:  Notice that the student is not asked to solve the problem, but to explain the reasoning. Density can be used as a conversion factor because the definition essentially states that x g of substance is equivalent to y mL of the substance. Therefore, the two conversion factors,  and , can be written and the appropriate one used to make the desired conversion.
Diff: 3
Section:  1.12
LO:  1.13
Global LO:  G4