Given that standard heat enthalpy of CII4, C2 II4 and C3 I I8 are 17.9,12.5 and 24.8 kca 1 / mol

Name: Problem 36, Chapter 6: Objective Chemistry for Engineering and Medical Entrance Examinations
Uploaded: 2022-01-25T12:27:06-08:00
Duration: 41 s
Channel: Mishal Gul
Description: Given that standard heat enthalpy of CII4, C2 II4 and C3 I I8 are 17.9,12.5 and 24.8 kca 1 / mol, respective- ly. The ΔH for the reaction CII4+C2 II4 →C3 I I8 is (1) 55.2 kcal (2) 30.2 kcal (3) 55.2 kcal (4) 19.4

step 1 Given that standard heat of enthalpy of methane, ethan and propane are 17 .9, 12 .5 and 24 .8 ki

Question

Given that standard heat enthalpy of $\mathrm{CII}_{4}, \mathrm{C}_{2} \mathrm{II}_{4}$ and $\mathrm{C}_{3} \mathrm{I} \mathrm{I}_{8}$ are $17.9,12.5$ and $24.8 \mathrm{kca} 1 / \mathrm{mol}$, respective- ly. The $\Delta H$ for the reaction $\mathrm{CII}_{4}+\mathrm{C}_{2} \mathrm{II}_{4} \rightarrow \mathrm{C}_{3} \mathrm{I} \mathrm{I}_{8}$ is (1) $55.2 \mathrm{kcal}$ (2) $30.2 \mathrm{kcal}$ (3) $55.2 \mathrm{kcal}$ (4) $19.4$

   Given that standard heat enthalpy of $\mathrm{CII}_{4}, \mathrm{C}_{2} \mathrm{II}_{4}$ and $\mathrm{C}_{3} \mathrm{I} \mathrm{I}_{8}$ are $17.9,12.5$ and $24.8 \mathrm{kca} 1 / \mathrm{mol}$, respective-
ly. The $\Delta H$ for the reaction $\mathrm{CII}_{4}+\mathrm{C}_{2} \mathrm{II}_{4} \rightarrow \mathrm{C}_{3} \mathrm{I} \mathrm{I}_{8}$ is
(1) $55.2 \mathrm{kcal}$
(2) $30.2 \mathrm{kcal}$
(3) $55.2 \mathrm{kcal}$
(4) $19.4$

Objective Chemistry for Engineering and Medical Entrance Examinations

K Rama Rao 1st Edition

Chapter 6, Problem 36

Instant Answer

Solved by Expert Mishal Gul

01/25/2022

Step 1

9,12.5$ and $24.8 \mathrm{kcal/mol}$, respectively. Show more…

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Given that standard heat enthalpy of $\mathrm{CII}_{4}, \mathrm{C}_{2} \mathrm{II}_{4}$ and $\mathrm{C}_{3} \mathrm{I} \mathrm{I}_{8}$ are $17.9,12.5$ and $24.8 \mathrm{kca} 1 / \mathrm{mol}$, respective- ly. The $\Delta H$ for the reaction $\mathrm{CII}_{4}+\mathrm{C}_{2} \mathrm{II}_{4} \rightarrow \mathrm{C}_{3} \mathrm{I} \mathrm{I}_{8}$ is (1) $55.2 \mathrm{kcal}$ (2) $30.2 \mathrm{kcal}$ (3) $55.2 \mathrm{kcal}$ (4) $19.4$

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Key Concepts

Enthalpy Change Calculation

This involves determining the overall heat change of a reaction by summing the standard enthalpies of formation of the products, weighed by their stoichiometric coefficients, and subtracting the sum of the standard enthalpies of formation of the reactants. This method is essential for evaluating the energetics of chemical reactions.

Hess's Law

A principle stating that the enthalpy change for a chemical reaction is independent of the pathway between the initial and final states. It allows one to calculate the overall reaction enthalpy using the standard enthalpies of formation of reactants and products.

Standard Enthalpy of Formation

This is the heat change that occurs when one mole of a substance is formed from its elements in their standard states under standard conditions. It serves as a fundamental thermodynamic property used to calculate reaction enthalpies.

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