2. 16 A graduated cylinder contains 155 mL of water. A 15.0-g piece of iron and

Question

2. 16 A graduated cylinder contains 155 mL of water. A 15.0-g piece of iron and a 20.0-g piece of lead are added. What is the new water level, in milliliters, in the cylinder (see Table 2.8)? (2.7) CHALLENGE PROBLEMS The following problems are related to the topics in this chapter. How- er, they do not all follow the chapter order, and they require you to combine concepts and skills from several Sections. These problems will help you increase your critical thinking skills and prepare for your Cli next exam. 2.1 115 A balance measures mass to 0.001 g. If you determine the mass of an object that weighs about 31 g, would you record the mass as 31 g. 31.1 g, 31.08 g, 31.075 g, or 31.0750? Explain your choice by writing two to three complete sentences that describe your thinking. (2.3) 16 When three students use the same meterstick to measure the 2.1 length of a paper clip, they obtain results of 5.8 cm, 5.75 cm, and 5.76 cm. If the meterstick has millimeter markings, what are some reasons for the different values? (2.3) 2.117 A car travels at 55 mi/h and gets 11 km/L of gasoline. How many gallons of gasoline are needed for a 3.0-h trip? (2.6) 2.118 A sunscreen preparation contains 2.50% benzyl salicylate by mass. If a tube contains 4.0 oz of sunscreen, how many kilo- grams of benzyl salicylate are needed to manufacture 325 tubes of sunscreen? (2.6) 2.119 How many milliliters of olive oil have the same mass as 1.50 L of gasoline (see Table 2.8)? (2.7) 2.120 A 50.0-g silver object and a 50.0-g gold object are both added to 75.5 mL of water contained in a graduated

Explanation / Answer

First let's understand conversion factors, 1 mi = 1.6 km

Thus speed of the car = 55 mi/h = 55*1.6 Km/h = 88 Km/h

Then in 3 h car will travel = 88*3 Km = 264 Km

in 1 L of gasoline it goes fo 11 Km, then for 264 Km it will require = 264 / 11 = 24 L of gasoline

1 G = 3.79 L (US Gallon)

24 L of gasoline = 24 / 3.79 = 6.33 gallon gasoline

For 3 h trip car needed 6.33 gallon of gasoline.

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