Concept explainers
(a)
Interpretation: The
Concept introduction: The
(b)
Interpretation: The
Concept introduction: The chemical reactions in which energy is released during the formation of products known as exothermic reactions. The energy released during the reaction is denoted by
Want to see the full answer?
Check out a sample textbook solutionChapter 6 Solutions
ORGANIC CHEMISTRY
- What is the likelihood that hydrogen (H2) will become a widely used fuel and that the hydrogen economy will become a reality? In particular, what are the advantages and disadvantages of H2 as a fuel? What would be necessary for a significant conversion to a hydrogen economy?arrow_forwardComparing the chemistry of carbon and silicon. (a) Write balanced chemical equations for the reactions of H2O() with CH4 (forming CO2 and H2) and SiH4 (forming SiO2 and H2). (b) Using thermodynamic data, calculate the standard free energy change for the reactions in (a). Is either reaction product-favored at equilibrium? (c) Look up the electronegativities of carbon, silicon, and hydrogen. What conclusion can you draw concerning the polarity of CH and SiH bonds? (d) Carbon and silicon compounds with the formulas (CH3)2CO (acetone) and [(CH3)2SiO]n (a silicone polymer) also have quite different structures. Draw Lewis structures for these species. This difference, along with the difference between structures of CO2 and SiO2, suggests a general observation about silicon compounds. Based on that observation, do you expect that a silicon compound with a structure similar to ethene (C2H4) exists?arrow_forwardFrom data in Appendix 4, calculate H, S, and G for each of the following reactions at 25C. a. CH4(g) + 2O2(g) CO2(g) + 2H2O(g) b. 6CO2(g)+6H2O(l)C6H12O6(s)Glucose+6O2(g) c. P4O10(s) + 6H2O(l) 4H3PO4(s) d. HCl(g) + NH3(g) NH4Cl(s)arrow_forward
- How much heat (J) is given off when 8.2 mg of Al reacts with the right stoichiometric amount of Fe2O3 in the thermite reaction. Use the enthalpy of combustion and the balanced reaction equation. Make sure to indicate the answer to be either negative or positive. Your answer should be to 2 decimal places. ΔH = -852 kJarrow_forwardCalculate ΔHo for each oxidation reaction. Attached equation is balanced as written; remember to take into account the coefficients in determining the number of bonds broken or formed. [ΔHo for O2 = 497 kJ/mol; ΔHo for one C=O in CO2 = 535 kJ/mol]arrow_forward22. Given that the enthalpy of neutralization for the reaction of HCl (a strong acid) and NaOH (a strong base) is always -55.90 kJ per mole of H2O formed, what is the concentration of a 65 mL sample of HCl if the enthalpy of neutralization for the reaction was found to be -5.38 kJ, assuming no heat is lost to the calorimeter? 0.96 M 1.48 M 1.60 M 0.38 M 4.63 Marrow_forward
- The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, ΔH, changes sign when a process is reversed. Consider the reaction H2O(l)→H2O(g), ΔH =44.0kJ What will ΔH be for the reaction if it is reversed?arrow_forwardGiven the listed average bond energies (BE), calculate the enthalpy change for the production of one mole of methanol (CH3OH) by the following reaction. (There are two C=O double bonds in CO2) CO2(g) + 3 H2(g) → CH3OH(g) + H2O(g) B.E.C–O = 300 kJ/mol B.E.C=O = 700 kJ/mol B.E.H–H = 450 kJ/mol B.E.H–O = 500 kJ/mol B.E.H–C = 400 kJ/mol Select one: a. -250 kJ b. -950 kJ c. 950 kJ d. 50 kJ e. 250 kJarrow_forwardWrite a balanced equation for the formation of CO2(g) from C(s) and O2(g). Calculate the enthalpy change for this reaction using the following data (at 25 degrees Celsius): C(s) + 1/2 O2(g) --> CO(g) change in H = -111 kJ CO(g) + 1/2 O2(g) --> CO2(g) change in H = -394 kJ Is the reaction endothermic or exothermic?arrow_forward
- Aditional information: Delta Gof for NH3(g) is -16,5 kJ/mol. Delta Gof for N2 is 0.0 kJ/mol. Delta Gof for H2 is 0.0 kJ/mol.arrow_forwardConsider the two products CO2 and H2O for the combustion of ethanol. Use what you have learned about molecular geometry, polarity, and intermolecular forces to explain why CO2 is a gas at room temperature but H2O is a liquid at room temperature.arrow_forwardA sample of a hydrocarbon is completely combusted in presence in O2(g) to produce 21.83 g carbon dioxide, 4.47 g H2O, and 311 KJ of heat. What is the mass of hydrocarbon sample that was combusted? What is the empirical formula of the hydrocarbon? Calculate the value of Ho per empirical-formula unit of the hydrocarbon. Do you think that the hydrocarbon is one of those listed in appendix C? Explain your answer.arrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistry: An Atoms First ApproachChemistryISBN:9781305079243Author:Steven S. Zumdahl, Susan A. ZumdahlPublisher:Cengage Learning
- Chemistry & Chemical ReactivityChemistryISBN:9781133949640Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage LearningChemistry & Chemical ReactivityChemistryISBN:9781337399074Author:John C. Kotz, Paul M. Treichel, John Townsend, David TreichelPublisher:Cengage Learning