CHEM FOR ENGNRNG SDNTS (EBOOK) W/ACCES
3rd Edition
ISBN: 9781337739382
Author: Brown
Publisher: CENGAGE L
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Chapter 1, Problem 1.6PAE
Use the web to determine the differences in the amounts of aluminum recycled in states where there are deposits on aluminum cans versus states where recycling is voluntary. What is the most reliable way to estimate this value? mat uncertainty is there in the estimate?
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4. A new procedure for the determination of sulfur in coal was tested on a standard coal sample with a certified value of 2.14% sulfur by mass. The new procedure gave results of 2.11%, 2.07%, 2.04%, 2.06%, and 2.16% for five separate determinations.
a) Does the new procedure give the correct result at the 95% confidence level?
b) Does the new procedure give the correct result at the 90% confidence level?
Carbon dioxide emissions associated with a one-night stay in a hotel room are calculated at 28.98 kg of CO2 per room day for an average hotel. The 250 rooms of your hotel are all occupied for two days during a college football game. How much CO2 did the guests and hotel release into the atmosphere? Round your answer to the nearest whole number.
kgs
1. More than 2000 years ago human cultures figured out a way to produce iron metal from rocks
containing iron ores. This iron could be worked by a blacksmith (repeated heating and hammering) to
make iron metal pure enough for creating useful tools (even Samurai swords). This direct heating
technique was common up until about 200 years ago when people found a better way to obtain iron
metal.
When hematite, Fe2O3(s), is strongly heated in a blast furnace in the presence of charcoal (carbon), pure
iron metal is obtained.
Fe2O3()
2 Fe(s) + 3/2 O2 (g)
(1)
C(s) + O2 (g) → CO2(g)
(2)
When reaction 1 is coupled to reaction 2, overall chemical equation is
Fe2O3() + 3/2 C()
3/2 CO2(g) + 2 Fee)
Use the thermodynamic data given below for the following calculations:
AG¡ (kJ/mol) | 4H¡ (kJ/mol) | S (J/mol-K)
Fe2O3(s)
-742.2
-824.2
87.40
Fes)
27.28
CO2(8)
-394.36
-393.51
213.74
C (6)
5.74
O2 (2)
205.14
a) Calculate the standard Gibb's free energy change for reaction 1
b) Calculate the standard Gibb’s…
Chapter 1 Solutions
CHEM FOR ENGNRNG SDNTS (EBOOK) W/ACCES
Ch. 1 - Prob. 1COCh. 1 - Prob. 2COCh. 1 - Draw pictures to illustrate simple chemical...Ch. 1 - Explain the difference between inductive and...Ch. 1 - Use appropriate techniques to convert measurements...Ch. 1 - Express the results of calculations using the...Ch. 1 - Use the web to determine the mass of a steel...Ch. 1 - Prob. 1.2PAECh. 1 - Where does the scientific method start? What is...Ch. 1 - Use the web to determine the amount of aluminum...
Ch. 1 - Use the web to find current prices offered for...Ch. 1 - Use the web to determine the differences in the...Ch. 1 - When we make observations in the laboratory, which...Ch. 1 - Which of the following items are matter and which...Ch. 1 - Which macroscopic characteristics differentiate...Ch. 1 - How can a liquid be distinguished from a fine...Ch. 1 - Some farmers use ammonia, NHS, as a fertilizer....Ch. 1 - 1.10 Do the terms element and atom mean the same...Ch. 1 - 1.11 Label each of the following as either a...Ch. 1 - 1.12 Why do physical properties play a role in...Ch. 1 - 1.13 Physical properties may change because of a...Ch. 1 - 1.14 Which part of the following descriptions of a...Ch. 1 - Use a molecular level description to explain why...Ch. 1 - All molecules attract each other to some extent,...Ch. 1 - 1.15 We used the example of attendance at a...Ch. 1 - 1.16 Complete the following statement: Data that...Ch. 1 - 1.17 Complete the following statement: Data that...Ch. 1 - 1.18 Two golfers are practicing shots around a...Ch. 1 - Prob. 1.23PAECh. 1 - 1.20 Suppose that you are waiting at a corner for...Ch. 1 - 1.21 When a scientist looks at an experiment and...Ch. 1 - 1.22 What is the difference between a hypothesis...Ch. 1 - 1.23 Should the words theory and model be used...Ch. 1 - 1.24 What is a law of nature? Are all scientific...Ch. 1 - 1.25 Describe a miscommunication that can arise...Ch. 1 - 1.26 What is the difference between a qualitative...Ch. 1 - 1.27 Identify which of the following units are...Ch. 1 - 1.28 What is a “derived” unit?Ch. 1 - 1.29 Rank the following prefixes in order of...Ch. 1 - 1.30 The largest computers now include disk...Ch. 1 - Prob. 1.35PAECh. 1 - 1.32 Use the web to determine how the Btu was...Ch. 1 - 1.33 How many micrograms are equal to one gram?Ch. 1 - 1.34 Convert the value 0.120 ppb into ppm.Ch. 1 - 1.35 How was the Fahrenheit temperature scale...Ch. 1 - Superconductors are materials that have no...Ch. 1 - 1.37 Express each of the following temperatures in...Ch. 1 - 1.38 Express (a) 275 oC in K, (b) 25.55 K in oC,...Ch. 1 - 1.39 Express each of the following numbers in...Ch. 1 - 1.40 How many significant figures are there in...Ch. 1 - 1.41 How many significant figures are present in...Ch. 1 - Perform these calculations and express the result...Ch. 1 - 1.43 Calculate the following to the correct number...Ch. 1 - 1.44 In an attempt to determine the velocity of a...Ch. 1 - 1.45 A student finds that the mass of an object is...Ch. 1 - 1.46 Measurements indicate that 23.6% of the...Ch. 1 - 1.47 A student weighs 10 quarters and finds that...Ch. 1 - 1.48 A rock is placed on a balance and its mass is...Ch. 1 - 1.49 A package of eight apples has a mass of 1.00...Ch. 1 - Prob. 1.54PAECh. 1 - 1.51 A person measures 173 cm in height. What is...Ch. 1 - 1.52 The distance between two atoms in a molecule...Ch. 1 - 1.53 Carry out the following unit conversions. (a)...Ch. 1 - 1.54 Carry out each of the following conversions....Ch. 1 - 1.55 Convert 22.3 mL to (a) liters, (b) cubic...Ch. 1 - 1.56 If a vehicle is travelling 92 m/s, what is...Ch. 1 - 1.57 A load of asphalt weights 245 lb. and...Ch. 1 - 1.58 One square mile contains exactly 640 acres....Ch. 1 - 1.59 A sample of crude oil has a density of 0.87...Ch. 1 - 1.60 Mercury has a density of 13.6 g/mL. What is...Ch. 1 - 1.61 The area of the 48 contiguous states is...Ch. 1 - 1.62 The dimensions of aluminium foil in a box for...Ch. 1 - Prob. 1.67PAECh. 1 - 1.64 Wire is often sold in pound spools according...Ch. 1 - 1.65 An industrial engineer is designing a process...Ch. 1 - 1.66 An engineer is working with archaeologists to...Ch. 1 - Draw a molecular scale picture to show how a...Ch. 1 - Prob. 1.72PAECh. 1 - 1.67 On average, Earth’s crust contains about 8.1...Ch. 1 - Prob. 1.74PAECh. 1 - 1.69 The “Western Stone” in Jerusalem is one of...Ch. 1 - A load of bauxite has a density of 3.15 g/cm3. If...Ch. 1 - Prob. 1.77PAECh. 1 - Prob. 1.78PAECh. 1 - Prob. 1.79PAECh. 1 - Prob. 1.80PAECh. 1 - Prob. 1.81PAECh. 1 - Use the web to research the elastic modulus and...Ch. 1 - Prob. 1.83PAECh. 1 - 1.84 A student was given two metal cubes that...Ch. 1 - 1.85 Battery acid has a density of 1.285 g/mL and...Ch. 1 - 1.86 Unfermented grape juice used to make wine is...Ch. 1 - 1.87 A solution of ethanol in water has a volume...Ch. 1 - 1.88 Legend has it that Archimedes, a famous...Ch. 1 - 1.89 Imagine that you place a cork measuring...Ch. 1 - 1.90 A calibrated flask was filled to the 25.00-mL...
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- A rebreathing gas mask contains potassium superoxide, KO2, which reacts with moisture in the breath to give oxygen. 4KO2(s)+2H2O(l)4KOH(s)+3O2(g) Estimate the grams of potassium superoxide required to supply a persons oxygen needs for one hour. Assume a person requires 1.00 102 kcal of energy for this time period. Further assume that this energy can be equated to the heat of combustion of a quantity of glucose, C6H12O6, to CO2(g) and H2O(l). From the amount of glucose required to give 1.00 102 kcal of heat, calculate the amount of oxygen consumed and hence the amount of KO2 required. The ff0 for glucose(s) is 1273 kJ/mol.arrow_forwardUse the web to find current prices offered for aluminum for recycling. Is there variation in the price based on where in the United States the aluminum is returned?arrow_forwardAssume that the radius of Earth is 6400 km, the crust is 50. km thick, the density of the crust is 3.5 g/cm3, and 25.7% of the crust is silicon by mass. Calculate the total mass of silicon in the crust of Earth.arrow_forward
- A newspaper article states that biomass has actually been used as an energy source throughout human history. Do you agree or disagree with this statement? Defend your answer.arrow_forwardThe carbon dioxide exhaled in the breath of astronauts is often removed from the spacecraft by reaction with lithium hydroxide 2LiOH(s)+CO2(g)Li2CO3(s)+H2O(l) Estimate the grams of lithium hydroxide required per astronaut per day. Assume that each astronaut requires 2.50 103 kcal of energy per day. Further assume that this energy can be equated to the heat of combustion of a quantity of glucose, C6H12O6, to CO2(g) and H2O(l). From the amount of glucose required to give 2.50 103 kcal of heat, calculate the amount of CO2 produced and hence the amount of LiOH required. The H for glucose(s) is 1273 kJ/mol.arrow_forward4.60 Why are fuel additives used?arrow_forward
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- A number of reactions can be used to generate common gases on a laboratory scale. For example, nitrogen can be produced from sodium metal and potassium nitrate as indicated by the balanced equation: 10Na(s)+2KNO3(s)==>K2O+5Na2O(s)+N2(g) A common laboratory-scale reaction can also generate oxygen gas by heating potassium chlorate, as indicated by the balanced equation: 2KClO3(s)==>2KCl(s)+3O2(g) What mass of potassium nitrate is needed to generate 237.0 L of gas, composed of 125.0 L of N2 and 112.0 L of O2 at 0.920 atm and 299 K, using these two reactions? What mass of potassium chlorate is needed to generate 237.0 L of gas, composed of 125.0 L of N2 and 112.0 L of O2 at 0.920 atm and 299 K, using these two reactions?arrow_forward1. A candle is placed on one pan of a balance, and an equal weight is placed on the other pan. What would happen if you lit up the candle and waited for a while? Suppose the candle was placed in a large, sealed jar that allowed it to burn for several minutes before running out of oxygen. The candle and jar are balanced by an equal weight. In this situation, what would happen if you lit up the candle and waited?arrow_forwardPart A An iron ore sample contains Fe2 O3 together with other substances. Reaction of the ore with CO produces iron metal: Balance this equation. a Fe2O3 (s) + BCO(g) → y Fe(s)+ 8 CO2 (g). You may want to reference (Pages 103 - 105) Section 3.6 while completing this problem. Express your answer as a balanced chemical equation. Identify all of the phases in your answer. ΑΣφ A chemical reaction does not occur for this question. Submit Request Answer Part B Calculate the number of grams of CO2 formed when 0.310 kg of Fe2 O3 reacts. Express your answer in grams to three significant figures.arrow_forward
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