Concept explainers
(a)
Interpretation: The given reaction is to be classified as an endothermic or exothermic reaction by calculating the
Concept introduction: The
(b)
Interpretation: The reaction is to be classified as endothermic or exothermic reaction by calculating the
Concept introduction: The chemical reactions in which energy is released during the formation of products are known as exothermic reactions. In endothermic reactions, reactants absorb the energy to form the desired product. Exothermic and endothermic reactions are opposite to each other. The value of
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- Use the same fat described in Question 27. (a) Write a thermochemical equation for the metabolism of fat. (b) A dieter reduces his food intake by 425 nutritional calories a day (1 nutritional calorie=1000calories). How many kJ can he lose in one day? (c) How many pounds of fat are lost in one week with this diet?arrow_forwardUse Table 8.3 to obtain AHO for the following thermochemical equations: (a) Mg(OH)2(s)+2NH4+(aq)Mg2+(aq)+2NH3(g)+2H2O(l) (b) PbO(s)+C(s)CO(g)+Pb(s) (c) Mn(s)+4 H+(aq)+SO42 Mn2+(aq)+SO2(g)+2H2O(l)arrow_forwardYou have a large balloon containing 1.0 mol of gaseous water vapor at 80 C. How will each step affect the internal energy of the system? (a) The temperature of the system is raised to 90 C. (b) The vapor is condensed to a liquid, at 40 C.arrow_forward
- xplain why aluminum cans make good storage containers for soft drinks. Styrofoam cups can be used to keep coffee hot and cola cold. How can this be?arrow_forward9.68 What are some features of petroleum that make it such an attractive fuel?arrow_forwardWould the amount of heat absorbed by the dissolution in Example 5.6 appear greater, lesser, or remain the same if the experimenter used a calorimeter that was a poorer insulator than a coffee cup calorimeter? Explain your answer.arrow_forward
- 9.75 Explain why each of the following chemical equations is not a correct formation reaction. (a) 4Al(s)+3O2(g)2Al2O3(s) (b) N2(g)+32H2(g)NH3(g) (c) 2Na(s)+O(g)Na2O(s)arrow_forward9.38 The energy densities of various types of coal are listed below: Anthracite 35 kJ/g Subbituminous 31 kJ/g Bituminous 28 kJ/g Lignite 26 kJ/g An unknown sample of one of these coals is burned in an apparatus with a calorimeter constant of 1.3 kJ/°C. When a 0.367-g sample is used, the temperature change is 8.75°C. Which type of coal is the sample?arrow_forwardConsider the following potential energy diagrams for two different reactions. Which plot represents an exothermic reaction? In plot a, do the reactants on average have stronger or weaker bonds than the products? In plot b, reactants must gain potential energy to convert to products. How does this occur?arrow_forward
- Using the data in Appendix G, calculate the standard enthalpy change for each of the following reactions: (a) Si(s)+2F2(g)SiF4(g) (b) 2C(s)+2H2(g)+O2(g)CH3CO2H(l) (c) CH4(g)+N2(g)HCN(g)+NH3(g) ; (d) CS2(g)+3Cl2(g)CCl4(g)+S2Cl2(g)arrow_forwardAlloys When a 58.8-g piece of hot alloy is placed in125 g of cold water in a calorimeter, the temperature ofthe alloy decreases by 106.1°C, while the temperature ofthe water increases by 10.5°C. What is the specific heat ofthe alloy?arrow_forwardFor the reaction HgO(s)Hg(l)+12O2(g),H=+90.7kJ: a.What quantity of heat is required to produce 1 mole of mercury by this reaction? b.What quantity of heat is required to produce 1 mole of oxygen gas by this reaction? c.What quantity of heat would be released in the following reaction as written? 2Hg(l) + O2(g) 2HgO(s)arrow_forward
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