Questions: Using the bond energies found in the table below, show the calculation of the approximate enthalpy change, ΔH, for the following reaction: C3H8(g)+5O2(g) → 3CO2(g)+4H2O(l) Bond Bond Energy (kJ/mol) C-H 415 C-C 345 O=O 498 C=O 741 H-O 464

Using the bond energies found in the table below, show the calculation of the approximate enthalpy change, ΔH, for the following reaction: C3H8(g)+5O2(g) → 3CO2(g)+4H2O(l) Bond Bond Energy (kJ/mol) C-H 415 C-C 345 O=O 498 C=O 741 H-O 464
Transcript text: Using the bond energies found in the table below, show the calculation of the approximate enthalpy change, $\Delta H$, for the following reaction: \[ \mathrm{C}_{3} \mathrm{H}_{8}(\mathrm{~g})+5 \mathrm{O}_{2}(\mathrm{~g}) \rightarrow 3 \mathrm{CO}_{2}(\mathrm{~g})+4 \mathrm{H}_{2} \mathrm{O}(\mathrm{l}) \] \begin{tabular}{|l|l|} \hline Bond & Bond Energy $\left(\frac{\mathrm{kJ}}{\mathrm{mol}}\right)$ \\ \hline C-H & 415 \\ \hline C-C & 345 \\ \hline O=O & 498 \\ \hline C=O & 741 \\ \hline H-O & 464 \\ \hline \end{tabular}
failed

Solution

failed
failed

Solution Steps

Step 1: Calculate the total bond energy of the reactants.

C3H8 has two C-C bonds and eight C-H bonds. O2 has five O=O bonds. Total bond energy of reactants = 2(345) + 8(415) + 5(498) = 690 + 3320 + 2490 = 6500 kJ/mol

Step 2: Calculate the total bond energy of the products.

CO2 has three molecules, each with two C=O bonds. H2O has four molecules, each with two H-O bonds. Total bond energy of products = 3 * 2 * (741) + 4 * 2 * (464) = 4446 + 3712 = 8158 kJ/mol

Step 3: Calculate the enthalpy change.

ΔH = (Total bond energy of reactants) - (Total bond energy of products) ΔH = 6500 kJ/mol - 8158 kJ/mol = -1658 kJ/mol

Final Answer

-1658 kJ/mol

Was this solution helpful?
failed
Unhelpful
failed
Helpful

Questions asked by other users

failedAnswered
Three days later you return to work and find the patient out of ICU and on the pulmonary floor. The patient is preparing for discharge. The physician asks you for your recommendations on what should be included in his discharge care plan. What do you recommend? (CHOOSE ONLY ONE unless you are directed to "Make another selection in this Section")
failedAnswered
Weights of golden retriever dogs are normally distributed. Samples of weights of golden retriever dogs, each of size n=15, are randomly collected and the sample means are found. Is it correct to conclude that the sample means cannot be treated as being from a normal distribution because the sample size is too small? Explain. Choose the correct answer below. A. Yes; the sample size must be over 30 for the sample means to be normally distributed. B. No; as long as more than 30 samples are collected, the sample means will be normally distributed. C. No; the samples are collected randomly, so the sample means will be normally distributed for any sample size. D. No; the original population is normally distributed, so the sample means will be normally distributed for any sample size.
failedAnswered
Triangle D'E'F' is the image of triangle DEF under a reflection across the x-axis followed by a rotation about the origin. Write the rules for the reflection and rotation. Reflection: (x, y) maps to (x, -y) Rotation: (x, y) maps to (?, ?)
failedAnswered
Which is the equation for the line containing points (8,-5) and (8,3) ? y=8 y=-13/5 x+119/5 y=-13/5 x+89/5 x=8
failedAnswered
List the interval(s) on which the function is increasing. (-∞,-6],[-2,-1] List the interval(s) on which the function is decreasing. [-6,-5] List the interval(s) on which the function is constant. [-5,-2][-1, ∞)