Principles of General Chemistry
3rd Edition
ISBN: 9780073402697
Author: SILBERBERG, Martin S.
Publisher: McGraw-Hill College
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Chapter 6, Problem 6.9P
The nutritional calorie (Calorie) is equivalent to 1 kcal. One pound of body fat is equivalent to about
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Chapter 6 Solutions
Principles of General Chemistry
Ch. 6 - Prob. 6.1PCh. 6 - An adiabatic process is one that involves no heat...Ch. 6 - Name a common device used to accomplish each...Ch. 6 - Prob. 6.4PCh. 6 - A system receives 425 J of heat from and delivers...Ch. 6 - A system releases 255 cal of heat to the...Ch. 6 - Prob. 6.7PCh. 6 - Prob. 6.8PCh. 6 - The nutritional calorie (Calorie) is equivalent to...Ch. 6 - Classify the following processes as exothermic or...
Ch. 6 - Why can we measure only changes in enthalpy, not...Ch. 6 - Draw an enthalpy diagram for a general exothermic...Ch. 6 - Prob. 6.13PCh. 6 - Prob. 6.14PCh. 6 - Prob. 6.15PCh. 6 - Write a balanced equaĂ¼on and draw an approximate...Ch. 6 - Write a balanced equation and draw an approximate...Ch. 6 - The circles represent a phase change at constant...Ch. 6 - The scenes below represent a physical change...Ch. 6 - What data do you need to determine the specific...Ch. 6 - Is the specific heat capacity of a substance an...Ch. 6 - Find q when 22.0 g of water is heated from 25.0C...Ch. 6 - Prob. 6.23PCh. 6 - A 295-g aluminum engine part at an initial...Ch. 6 - A 27.7-g sample of the radiator coolant ethylene...Ch. 6 - Two iron bolts of equal mass-one at 100.C, the...Ch. 6 - Prob. 6.27PCh. 6 - When 155 mL of water at 26C is mixed with 75 mL of...Ch. 6 - Prob. 6.29PCh. 6 - Prob. 6.30PCh. 6 - Prob. 6.31PCh. 6 - When 25.0 mL of 0.500MH2SO4 is added to 25.0 mL of...Ch. 6 - Would you expect O2(g)20(g) to have a positive or...Ch. 6 - Is H positive or negative when 1 mol of water...Ch. 6 - Prob. 6.35PCh. 6 - Consider the following balanced thermochemical...Ch. 6 - When 1 mol of NO(g) forms from Its elements, 90.29...Ch. 6 - Prob. 6.38PCh. 6 - Liquid hydrogen peroxide, an oxidizing agent in...Ch. 6 - Prob. 6.40PCh. 6 - Most ethylene (C2H4), the starting material for...Ch. 6 - Prob. 6.42PCh. 6 - Prob. 6.43PCh. 6 - Calculate H for Ca(s)+12O2(g)+CO2(g)CaCO3(s) Given...Ch. 6 - Calculate H for 2NOCl(g)N2(g)+O2(g)+Cl2(g) given...Ch. 6 - Write the balanced overall equation (equation 3)...Ch. 6 - Write the balanced overall equation (equation 3)...Ch. 6 - Diamond and graphite are two crystalline forms of...Ch. 6 - Prob. 6.49PCh. 6 - Prob. 6.50PCh. 6 - Use Table 6.3 or Appendix B to write a balanced...Ch. 6 - Prob. 6.52PCh. 6 - Calculate Hrxno for each of the following:...Ch. 6 - Calculate Hrxno for each of the following:...Ch. 6 - Copper(I) oxide can be oxidized to copperr (II)...Ch. 6 - Prob. 6.56PCh. 6 - Nitroglycerine, C3H5(NO3)3(l), a powerful...Ch. 6 - The common lead-acid car battery produces a large...Ch. 6 - Stearic acid (C18H36O2) is a fatty acid, a...Ch. 6 - A ballonist begins a trip in a helium-filled...Ch. 6 - Prob. 6.61PCh. 6 - Prob. 6.62PCh. 6 - Prob. 6.63PCh. 6 - Prob. 6.64PCh. 6 - Four 50.-g sample of different liquids are placed...Ch. 6 - When simple sugars, called monosaccharides, link...Ch. 6 - Reaction of gaseous CIF with F2 yields liquid...Ch. 6 - Prob. 6.68PCh. 6 - When organic matter decomposes under oxygen-free...Ch. 6 - The heat of atomization (Hatomo) is the heat...Ch. 6 - Prob. 6.71PCh. 6 - Prob. 6.72PCh. 6 - An aqueous wastes stream with a maximum...Ch. 6 - Kerosene, a common space-heater fuel, is a mixture...Ch. 6 - Prob. 6.75PCh. 6 - Phosphorus pentachloride is used in the industrial...Ch. 6 - Prob. 6.77PCh. 6 - Silicon tetrachloride is produced annually on the...Ch. 6 - Prob. 6.79PCh. 6 - You want to determine Ho for the reaction...Ch. 6 - Prob. 6.81PCh. 6 - Prob. 6.82PCh. 6 - Liquid methanol (CH3OH) can be used as an...Ch. 6 - How much heat is released when 25.0 g of methane...
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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_forwardThe equation for the fermentation of glucose to alcohol and carbon dioxide is: C6H12O6(aq) 2C2H5OH(aq) + 2CO2(g) The enthalpy change for the reaction is 67 kJ. Is this reaction exothermic or endothermic? Is energy, in the form of heat, absorbed or evolved as the reaction occurs?arrow_forwardWater gas, a mixture of carbon monoxide and hydrogen, is produced by treating carbon (in the form of coke or coal) with steam at high temperatures. (See Study Question 83.) C(s) + H2O(g) CO(g) + H2(g) Not all of the carbon available is converted to water gas since some is burned to provide the heat for the endothermic reaction of carbon and water. What mass of carbon must be burned (to CO2 gas) to provide the energy to convert 1.00 kg of carbon to water gas?arrow_forward
- Nitrogen monoxide, a gas recently found to be involved in a wide range of biological processes, reacts with oxygen to give brown NO2 gas. 2 NO(g) + O2(g) NO2(g)rH = 114.1 kJ/mol-rxn Is this reaction endothermic or exothermic? What is the enthalpy change if 1.25 g of NO is converted completely to NO2?arrow_forwardInsoluble PbBr2(s) precipitates when solutions of Pb(NO3)2(aq) and NaBr(aq) are mixed. Pb(NO3)2(aq) + 2 NaBr(aq) PbBr2(s) + 2 NaNO3(aq) rH = ? To measure the enthalpy change, 200. mL. of 0.75 M Pb(NO3)2(aq) and 200. mL of 1.5 M NaBr(aq) are mixed in a coffee-cup calorimeter. The temperature of the mixture rises by 2.44 C. Calculate the enthalpy change for the precipitation of PbBr2(s), in kJ/mol. (Assume the density of the solution is 1.0 g/mL., and its specific heat capacity is 4.2 J/g K.)arrow_forwardChlorine dioxide, ClO2, is a reddish yellow gas used in bleaching paper pulp. The average speed of a ClO2 molecule at 25C is 306 m/s. What is the kinetic energy (in joules) of a ClO2 molecule moving at this speed?arrow_forward
- The 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_forwardEnthalpy a A 100.-g sample of water is placed in an insulated container and allowed to come to room temperature at 21C. To heat the water sample to 41C, how much heat must you add to it? b Consider the hypothetical reaction,2X(aq)+Y(l)X2Y(aq)being run in an insulated container that contains 100. g of solution. If the temperature of the solution changes from 21C to 31C, how much heat does the chemical reaction produce? How does this answer compare with that in part a? (You can assume that this solution is so dilute that it has the same heat capacity as pure water.) c If you wanted the temperature of 100. g of this solution to increase from 21C to 51C, how much heat would you have to add to it? (Try to answer this question without using a formula.) d If you had added 0.02 mol of X and 0.01 mol of Y to form the solution in part b, how many moles of X and Y would you need to bring about the temperature change described in part c. e Judging on the basis of your answers so far, what is the enthalpy of the reaction 2X(aq) + Y(l) X2Y(aq)?arrow_forwardDefine each of the following terms: a. heat b. energy c. work d. system e. surroundings f. exothermic reaction g. endothermic reaction h. enthalpy of reaction i. kinetic energy j. potential energyarrow_forward
- Hypothetical elements A2 and B2 react according to the following equation, forming the compound AB. A2(aq)+B2(aq)2AB(aq);H=+271kJ/mol If solutions A2(aq) and B2(aq), starting at the same temperature, are mixed in a coffee-cup calorimeter, the reaction that occurs is a exothermic, and the temperature of the resulting solution rises. b endothermic, and the temperature of the resulting solution rises. c endothermic, and the temperature of the resulting solution falls. d exothermic, and the temperature of the resulting solution falls. e exothermic or endothermic, depending on the original and final temperatures.arrow_forwardWhen one mole of ethylene gas, C2H4, reacts with fluorine gas, hydrogen fluoride and carbon tetrafluoride gases are formed and 2496.7 kJ of heat are given off. What is Hf for CF4(g)?arrow_forwardIs the Sun exothermic or endothermic? Is it any less exothermic or endothermic in the winter, as opposed to the summer?arrow_forward
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