Which of the following statements is true?Breaking bonds and making bonds are both endothermicBreaking bonds is endothermic, making bonds is exothermicBreaking bonds is exothermic, making bonds is endothermicBreaking bonds and making bonds are both exothermic2When calculating energy changes from bond energies, what is the first thing you should do?Calculate the bond energies of the reactantsSubtract the bond energies of the products from those of the reactantsBalance the equationCalculate the bond energies of the products3If a reaction requires more energy to break the bonds in the reactants than the amount of energy released when new bonds are formed, what does this tell us?It is exothermicThe product is a gasIt is endothermicThe reactant is a solid4Calculate the energy required to break the bonds in propane (C3H8) given the following bond energies: C-C = 347 kJ/mol; C-H = 413 kJ/mol.1520 kJ/mol3998 kJ/mol4345 kJ/mol760 kJ/mol
Question
Which of the following statements is true?Breaking bonds and making bonds are both endothermicBreaking bonds is endothermic, making bonds is exothermicBreaking bonds is exothermic, making bonds is endothermicBreaking bonds and making bonds are both exothermic2When calculating energy changes from bond energies, what is the first thing you should do?Calculate the bond energies of the reactantsSubtract the bond energies of the products from those of the reactantsBalance the equationCalculate the bond energies of the products3If a reaction requires more energy to break the bonds in the reactants than the amount of energy released when new bonds are formed, what does this tell us?It is exothermicThe product is a gasIt is endothermicThe reactant is a solid4Calculate the energy required to break the bonds in propane (C3H8) given the following bond energies: C-C = 347 kJ/mol; C-H = 413 kJ/mol.1520 kJ/mol3998 kJ/mol4345 kJ/mol760 kJ/mol
Solution
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The correct statement is "Breaking bonds is endothermic, making bonds is exothermic". This is because energy is required to break existing bonds (endothermic process) and energy is released when new bonds are formed (exothermic process).
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When calculating energy changes from bond energies, the first thing you should do is "Balance the equation". This ensures that you are considering the correct number of each type of bond involved in the reaction.
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If a reaction requires more energy to break the bonds in the reactants than the amount of energy released when new bonds are formed, this tells us that "It is endothermic". An endothermic reaction is one that absorbs energy from its surroundings.
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To calculate the energy required to break the bonds in propane (C3H8), you need to consider the number of each type of bond in a molecule of propane. Propane has 2 C-C bonds and 8 C-H bonds. Therefore, the total energy required is (2347 kJ/mol) + (8413 kJ/mol) = 694 kJ/mol + 3304 kJ/mol = 3998 kJ/mol. So, the correct answer is "3998 kJ/mol".
Similar Questions
Which of the following statements is true?Breaking bonds is endothermic, making bonds is exothermicBreaking bonds and making bonds are both exothermicBreaking bonds and making bonds are both endothermicBreaking bonds is exothermic, making bonds is endothermic
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#01 bond makingThe following data give the energy needed to break the indicated bond. In the case of multiple bonds the energy applies to breaking the multiple bond completely. Bond formation, being the opposite, releases the same amount of heat from the chemical system.Bond Bond Dissociation EnergykJ/molBond Bond Dissociation EnergykJ/molC-H 413 C=O 745*C-C 347 C=C 614C-N 305 C≡C 839C-O 358 O=O 495O-H 463 N≡N 946 *C=O in carbon dioxide 804 kJ/molCalculate the heat released from the system on formation of 1.00 mol of the compound, methanal, CH2O from its individual atoms, 1 mol C, 2 mol H and 1 mol O. C + 2 H + O → CH2OMethanalQuestion 4Select one:a.1157 kJb.826 kJc.81 kJd.1571 kJe.745 kJ
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