General Chemistry: Atoms First
2nd Edition
ISBN: 9780321809261
Author: John E. McMurry, Robert C. Fay
Publisher: Prentice Hall
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Textbook Question
Chapter 8.12, Problem 8.26P
Biodiesel has a more favorable (more negative) combustion enthalpy per gram than ethanol. Explain, in light of your answer to Problem 8.25.
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Students have asked these similar questions
1. What is the enthalpy of reaction per mole of HCl (g) in the following reaction.( Don't have to explain why)
4HCl (g) + O2 (g) → 2Cl2 (g) + 2H2O + 114.4 kJ
a) -457.6 kJ / mol
b) -114.4 kJ / mol
c) -28.6 kJ / mol
d) +114.4 kJ / mol
2. The standard enthalpy of formation of a compound represents:
a) The thermal energy released by the decomposition of one mole of this compound.
b) The change in enthalpy when a mole of this compound is formed from its elements under standard conditions.
c) The change in enthalpy when one mole of an element turns into a compound.
d)The thermal energy released by the complete combustion of one mole of this compound.
e) The enthalpy change of the phase transition of one mole of this compound.
3. From the given compound below, calculate the heat of reaction at constant pressure.
Use the standard enthalpy table.
CH4 + 2 O2
Na2CO3 + 2 HCI
+ CO2 + H2O
2 NaCl + H2O + CO2
Calculate enthalpy using the following reactions:
Chapter 8 Solutions
General Chemistry: Atoms First
Ch. 8.2 - Which of the following are state functions, and...Ch. 8.3 - Calculate the work in kilojoules done during a...Ch. 8.3 - How much work is done in kilojoules, and in which...Ch. 8.4 - The following reaction has E = 186 kJ/mol. (a) Is...Ch. 8.5 - Assuming that Coca Cola has the same specific heat...Ch. 8.5 - What is the specific heat of lead if it takes 97.2...Ch. 8.5 - When 25.0 mL of 1.0 M H2SO4 is added to 50.0 mL of...Ch. 8.6 - The reaction between hydrogen and oxygen to yield...Ch. 8.6 - The explosion of 2.00 mol of solid trinitrotoluene...Ch. 8.7 - How much heat in kilojoules is evolved or absorbed...
Ch. 8.7 - Nitromethane (CH3NO2), sometimes used as a fuel in...Ch. 8.8 - The industrial degreasing solvent methylene...Ch. 8.8 - The reaction of A with B to give D proceeds in two...Ch. 8.8 - Draw a Hesss law diagram similar to that in...Ch. 8.9 - Use the information in Table 8.2 to calculate H in...Ch. 8.9 - Use the information in Table 8.2 to calculate H in...Ch. 8.10 - Use the data in Table 8.3 to calculate an...Ch. 8.10 - Use the data in Table 8.3 to calculate an...Ch. 8.11 - Liquid butane (C4H10), the fuel used in many...Ch. 8.12 - Ethane, C2H6, can be prepared by the reaction of...Ch. 8.12 - Is the reaction represented in the following...Ch. 8.12 - Which of the following reactions are spontaneous...Ch. 8.12 - Is the Haber process for the industrial synthesis...Ch. 8.12 - The following reaction is exothermic: (a) Write a...Ch. 8.12 - Write balanced equations for the combustion...Ch. 8.12 - Biodiesel has a more favorable (more negative)...Ch. 8 - The following reaction is exothermic: (a) Write a...Ch. 8 - Imagine a reaction that results in a change in...Ch. 8 - Redraw the following diagram to represent the...Ch. 8 - Prob. 8.30CPCh. 8 - Prob. 8.31CPCh. 8 - A reaction is carried out in a cylinder fitted...Ch. 8 - The following drawing portrays a reaction of the...Ch. 8 - Prob. 8.34CPCh. 8 - The following reaction of A3 molecules is...Ch. 8 - Prob. 8.36SPCh. 8 - What is internal energy?Ch. 8 - Prob. 8.38SPCh. 8 - Assume that the kinetic energy of a 1400 kg car...Ch. 8 - Prob. 8.40SPCh. 8 - The addition of H2 to CC double bonds is an...Ch. 8 - Prob. 8.42SPCh. 8 - Prob. 8.43SPCh. 8 - Prob. 8.44SPCh. 8 - Prob. 8.45SPCh. 8 - Prob. 8.46SPCh. 8 - Does a measurement carried out in a bomb...Ch. 8 - Prob. 8.48SPCh. 8 - Prob. 8.49SPCh. 8 - Prob. 8.50SPCh. 8 - When 0.187 g of benzene, C6H6, is burned in a bomb...Ch. 8 - When a solution containing 8.00 g of NaOH in 50.0...Ch. 8 - Prob. 8.53SPCh. 8 - Prob. 8.54SPCh. 8 - Prob. 8.55SPCh. 8 - Prob. 8.56SPCh. 8 - Prob. 8.57SPCh. 8 - Prob. 8.58SPCh. 8 - Prob. 8.59SPCh. 8 - Prob. 8.60SPCh. 8 - Prob. 8.61SPCh. 8 - Used in welding metals, the reaction of acetylene...Ch. 8 - Prob. 8.63SPCh. 8 - The familiar ether used as an anesthetic agent is...Ch. 8 - How much energy in kilojoules is required to...Ch. 8 - Prob. 8.66SPCh. 8 - Prob. 8.67SPCh. 8 - Prob. 8.68SPCh. 8 - Prob. 8.69SPCh. 8 - Prob. 8.70SPCh. 8 - Prob. 8.71SPCh. 8 - Prob. 8.72SPCh. 8 - Prob. 8.73SPCh. 8 - Prob. 8.74SPCh. 8 - Prob. 8.75SPCh. 8 - Prob. 8.76SPCh. 8 - Prob. 8.77SPCh. 8 - Prob. 8.78SPCh. 8 - Prob. 8.79SPCh. 8 - Prob. 8.80SPCh. 8 - Prob. 8.81SPCh. 8 - Styrene (C8H8), the precursor of polystyrene...Ch. 8 - Prob. 8.83SPCh. 8 - Prob. 8.84SPCh. 8 - Prob. 8.85SPCh. 8 - Prob. 8.86SPCh. 8 - Prob. 8.87SPCh. 8 - Use the bond dissociation energies in Table 8.3 on...Ch. 8 - Use the bond dissociation energies in Table 8.3 to...Ch. 8 - Prob. 8.90SPCh. 8 - Prob. 8.91SPCh. 8 - Prob. 8.92SPCh. 8 - Prob. 8.93SPCh. 8 - Prob. 8.94SPCh. 8 - Prob. 8.95SPCh. 8 - Prob. 8.96SPCh. 8 - Prob. 8.97SPCh. 8 - Prob. 8.98SPCh. 8 - Prob. 8.99SPCh. 8 - Prob. 8.100SPCh. 8 - Prob. 8.101SPCh. 8 - Prob. 8.102SPCh. 8 - Tell whether reactions with the following values...Ch. 8 - Prob. 8.104SPCh. 8 - Prob. 8.105SPCh. 8 - Prob. 8.106SPCh. 8 - Prob. 8.107SPCh. 8 - Prob. 8.108SPCh. 8 - Prob. 8.109SPCh. 8 - When 1.50 g of magnesium metal is allowed to react...Ch. 8 - Use the data in Appendix B to find standard...Ch. 8 - Prob. 8.112CHPCh. 8 - The boiling point of a substance is defined as the...Ch. 8 - What is the melting point of benzene in kelvin if...Ch. 8 - Metallic mercury is obtained by heating the...Ch. 8 - Prob. 8.116CHPCh. 8 - Methanol (CH3OH) is made industrially in two steps...Ch. 8 - Isooctane, C8H18, is the component of gasoline...Ch. 8 - We said in Section 8.1 that the potential energy...Ch. 8 - For a process to be spontaneous, the total entropy...Ch. 8 - Set up a Hesss law cycle, and use the following...Ch. 8 - Prob. 8.122CHPCh. 8 - Prob. 8.123CHPCh. 8 - Prob. 8.124CHPCh. 8 - Citric acid has three dissociable hydrogens. When...Ch. 8 - Prob. 8.126CHPCh. 8 - Imagine that you dissolve 10.0 g of a mixture of...Ch. 8 - Prob. 8.128CHPCh. 8 - Prob. 8.129MPCh. 8 - Phosgene, COCl2(g), is a toxic gas used as an...Ch. 8 - Prob. 8.131MPCh. 8 - (a) Write a balanced equation for the reaction of...Ch. 8 - Prob. 8.133MPCh. 8 - Reaction of gaseous fluorine with compound X...
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- n Section 10.7, two characteristics of enthalpy changes for reactions are listed. What are these characteristics? Explain why these characteristics are true.arrow_forward9.41 Under what conditions does the enthalpy change equal the heat of a process?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
- At 298 K, the standard enthalpies of formation for C2H2(g) and C6H6(l) are 227 kJ/mol and 49 kJ/mol, respectively. a. Calculate H for C6H6(l)3C2H2(g) b. Both acetylene (C2H2) and benzene (C6H6) can be used as fuels. Which compound would liberate more energy per gram when combusted in air?arrow_forwardYou discover that you cannot carry out a particular reaction for which you would like the enthalpy change. Does this mean that you will be unable to obtain this enthalpy change? Explain.arrow_forwardAlthough the gas used in an oxyacetylene torch (Figure 5.7) is essentially pure acetylene, the heat produced by combustion of one mole of acetylene in such a torch is likely not equal to the enthalpy of combustion of acetylene listed in Table 5.2. Considering the conditions for which the tabulated data are reported, suggest an explanation.arrow_forward
- Would the amount of heat absorbed by the dissolution in Example 5.6 appear greater, lesser, or remain the same if the heat capacity of the calorimeter were taken into account? Explain your answer.arrow_forwardn Fig. 10.1, what kind of energy does ball A possess initially when at rest at the top of the hill? What kind of energies are involved as ball A moves down the hill? What kind of energy does ball A possess when it reaches the bottom of the hill and stops moving after hitting ball B? Where did the energy gained by ball B, allowing it to move up the hill, come from?arrow_forwardIs the following reaction the appropriate one to use in determining the enthalpy of formation of methane, CH4(g)? Why or why not? C(g)+4H(g)CH4(g)arrow_forward
- Would the amount of heat measured for the reaction in Example 5.5 be greater, lesser, or remain the same if we used a calorimeter that was a poorer insulator than a coffee cup calorimeter? Explain your answer.arrow_forwardThe enthalpy of combustion of hard coal averages 35 kJ/g, that of gasoline, 1.28105 kJ/gal. How many kilograms of hard coal provide the same amount of heat as is available from 1.0 gallon of gasoline? Assume that the density of gasoline is 0.692 g/mL (the same as the density of isooctane).arrow_forwardanswer item 7 onlyarrow_forward
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