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- More sulfuric acid (density = 1.8302 g/cm3) is produced than any other chemical—approximately 3.6 * 1011 lb/yr world-wide. What is the volume of this amount in liters?
Problem 77
Problem 78
Which has more kinetic energy, a 1400 kg car moving at 115 km/h or a 12,000 kg truck moving at 38 km/h?
Problem 79
Assume that the kinetic energy of a 1400 kg car moving at 115 km/h (Problem 1.78) is converted entirely into heat. How many calories of heat are released, and what amount of water in liters could be heated from 20.0 °C to 50.0 °C by the car's energy? (One calorie raises the temperature of 1 mL of water by 1 °C)
- Sodium (Na) metal undergoes a chemical reaction with chlorine (Cl) gas to yield sodium chloride, or common table salt. If 1.00 g of sodium reacts with 1.54 g of chlorine, 2.54 g of sodium chloride is formed and 17.9 kJ of heat is released, how much sodium and how much chlorine in grams would have to react to release 171 kcal of heat?
Problem 81
- A Big Mac hamburger from McDonald’s contains 540 Calories. (a) How many kilojoules does a Big Mac contain?
Problem 82
- A 20 fluid oz. soda contains 238 Calories. (a) How many kilojoules does the soda contain? (b) For how many hours could the amount of energy in the soda light a 75-watt light bulb? (1 watt = 1 J/s)
Problem 83
- Which of the following statements uses exact numbers? (a) 1 ft = 12 in. (b) 1 cal = 4.184 J (c) The height of Mt. Everest is 29,035 ft. (d) The world record for the 1-mile run, set by Morocco's Hicham el Guerrouj in July 1999, is 3 minutes, 43.13 seconds
Problem 84
- What is the difference in mass between a nickel that weighs 4.8 g and a nickel that weighs 4.8673 g?
Problem 85
Problem 86a
How many significant figures are in each of the following measurements? (a) 35.0445 g
Problem 86b
How many significant figures are in each of the following measurements? (b) 59.0001 cm
Problem 86c
How many significant figures are in each of the following measurements? (c) 0.030 03 kg
Problem 86d
How many significant figures are in each of the following measurements? (d) 0.004 50 m
Problem 86e
How many significant figures are in each of the following measurements? (e) 67,000 m2
Problem 86f
How many significant figures are in each of the following measurements? (f) 3.8200⨉103 L
Problem 87a
How many significant figures are in each of the following measurements? (a) $130.95
Problem 87b
How many significant figures are in each of the following measurements? (b) 2000.003 g
Problem 87c
How many significant figures are in each of the following measurements? (c) 5 ft 3 in.
Problem 87d
How many significant figures are in each of the following measurements? (d) 510 J
Problem 87e
How many significant figures are in each of the following measurements? (e) 5.10⨉102 J
Problem 87f
How many significant figures are in each of the following measurements? (f) 10 students
Problem 88a
The Vehicle Assembly Building at the John F. Kennedy Space Center in Cape Canaveral, Florida, is the largest building in the world, with a volume of 3,666,500 m3 (a) Round off this quantity to four significant figures and then to two significant figures.
Problem 88b
The Vehicle Assembly Building at the John F. Kennedy Space Center in Cape Canaveral, Florida, is the largest building in the world, with a volume of 3,666,500 m3 (b) Express the answers in scientific notation.
Problem 89a
The diameter of the Earth at the equator is 7926.381 mi. (a) Round off this quantity to four significant figures and then to two significant figures.
Problem 89b
The diameter of the Earth at the equator is 7926.381 mi. (b) Express the answers in scientific notation.
Problem 90a
Round off the following quantities to the number of significant figures indicated in parentheses. (a) 35,670.06 m (4, 6)
Problem 90b
Round off the following quantities to the number of signifi-cant figures indicated in parentheses. (b) 68.507 g (2, 3)
Problem 90c
Round off the following quantities to the number of significant figures indicated in parentheses. (c) 4.995⨉103 cm (3)
Problem 90d
Round off the following quantities to the number of significant figures indicated in parentheses. (d) 2.309 85⨉10-4 kg (5)
Problem 91a
Round off the following quantities to the number of signifi-cant figures indicated in parentheses. (a) 7.0001 kg (4)
Problem 91b
Round off the following quantities to the number of signifi-cant figures indicated in parentheses. (b) 1.605 km