Concept explainers
(a)
Interpretation:
Concept Introduction:
For addition, the number with minimum number of significant figures is chosen and in the final answer same number of significant number is kept. The answer should not be more precise than the number with minimum number of significant figures.
(b)
Interpretation:
Concept Introduction:
For addition, the number with minimum number of significant figures is chosen and in the final answer same number of significant number is kept. The answer should not be more precise than the number with minimum number of significant figures.
(c)
Interpretation:
Concept Introduction:
For addition, the number with minimum number of significant figures after decimal point is chosen and in the final answer same number of significant number is kept after decimal point. The answer should not be more precise than the number with minimum number of significant figures.
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Introduction To General, Organic, And Biochemistry
- 1-78 The kinetic energy possessed by an object with a mass of 1 g moving with a velocity of 1 cm/s is called 1 erg. What is the kinetic energy, in ergs, of an athlete with a mass of 127 lb running at a velocity of 14.7 mi/h?arrow_forward1-93 The specific heat of urea is 1.339 J/g . If one adds 60.0 J of heat to 10.0 g of urea at 20oC, what would be the final temperature?arrow_forward1-68 The specific heat of steam is 0.48 cal/g oC. How many kilocalories are needed to raise the temperature of 10.5 kg of steam from 120oC to 150oC?arrow_forward
- 1-66 How many calories are required to heat the following (specific heats are given in Table 1-4)? (a) 52.7 g of aluminum from 100oC to 285oC (b) 93.6 g of methanol from —35oC to 55oC (c) 3.4 kg of lead from —33oC to 730oC (d) 71.4 g of ice from —77oC to —5oCarrow_forward1-70 (Chemical Connections IA) The average lethal dose of heroin is 1.52 mg/kg of body weight. Estimate how many grams of heroin would be lethal for a 200-lb man.arrow_forward1-67 If 168 g of an unknown liquid requires 2750 cal of heat to raise its temperature from 26oC to 74oC, what is the specific heat of the liquid?arrow_forward
- 1-86 The specific heats of some elements at 25oC are as follows: aluminum = 0.215 cal/g · oC; carbon (graphite) = 0.170 caI/g oC; iron = 0.107 cal/g mercury = 0.033 1 caI/g oC. (a) Which element would require the smallest amount of heat to raise the temperature of 100 g of the element by 10oC? (b) If the same amount of heat needed to raise the temperature of 1 g of aluminum by 25oC were applied to 1 g of mercury, by how many degrees would its temperature be raised? (c) If a certain amount of heat is used to raise the temperature of 1.6 g of iron by 10oC, the temperature of 1 g of which element would also be raised by 10oC, using the same amount of heat?arrow_forward1-92 A solar cell generates 500. kJ of energy per hour. To keep a refrigerator at 4oC, one needs 250. kcal/h. Can the solar cell supply sufficient energy per hour to maintain the temperature of the refrigerator?arrow_forward1-76 If the density of air is 1.25 10-3 g/cc, what is the mass in kilograms of the air in a room that is 5.3 m long, 4.2 m wide, and 2.0 m high?arrow_forward
- 1-112 A febrile, pediatric patient weighs 42 pounds. You need to administer acetaminophen (Tylenol) 15 mg/kg. (a) How many mg will you administer? (b) The acetaminophen (Tylenol) packages come in liquid form 160 mg/5.0 mL. How many mL will you administer to your 42 pound patient?arrow_forward1-51 A nurse practitioner orders isotonic sodium lactate 50. mL/kg body mass to be administered intravenously for a 139-lb patient with severe acidosis. The rate of flow is 150 gtts/min, and the IV administration set delivers 20. gtts/mL, where the unit “gtts” stands for drops of liquid. What is the running time in minutes?arrow_forward1-91 In calculating the specific heat of a substance, the following data are used: mass = 92.15 g; heat = 3.200 kcal; rise in temperature = 45oC. How many significant figures should you report in calculating the specific heat?arrow_forward
- Introduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage Learning