2.1 g of Fe combines with S cvolving 3.77 kJ. The heat of formation of FeS in kJ / mol is (1)

Name: Problem 38, Chapter 6: Objective Chemistry for Engineering and Medical Entrance Examinations
Uploaded: 2022-01-25T12:31:26-08:00
Duration: 34 s
Channel: Mishal Gul
Description: 2.1 g of Fe combines with S cvolving 3.77 kJ. The heat of formation of FeS in kJ / mol is (1) 3.77 (2) 1.78 (3) 100.5 (4) Nonc

step 1 2 .1 gram of firum combines with sulfur evolving 3 .77 kilojoules. The heat of formation of feru

Question

$2.1 \mathrm{~g}$ of Fe combines with S cvolving $3.77 \mathrm{~kJ}$. The heat of formation of FeS in $\mathrm{kJ} / \mathrm{mol}$ is (1) $3.77$ (2) $1.78$ (3) $100.5$ (4) Nonc

   $2.1 \mathrm{~g}$ of Fe combines with S cvolving $3.77 \mathrm{~kJ}$. The heat of formation of FeS in $\mathrm{kJ} / \mathrm{mol}$ is
(1) $3.77$
(2) $1.78$
(3) $100.5$
(4) Nonc

Objective Chemistry for Engineering and Medical Entrance Examinations

K Rama Rao 1st Edition

Chapter 6, Problem 38

Instant Answer

Solved by Expert Mishal Gul

01/25/2022

Step 1

The molar mass of Fe is approximately 55.85 g/mol. So, the number of moles of Fe is given by: \[n = \frac{m}{M} = \frac{2.1 \, \text{g}}{55.85 \, \text{g/mol}} = 0.0376 \, \text{mol}\] Show more…

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$2.1 \mathrm{~g}$ of Fe combines with S cvolving $3.77 \mathrm{~kJ}$. The heat of formation of FeS in $\mathrm{kJ} / \mathrm{mol}$ is (1) $3.77$ (2) $1.78$ (3) $100.5$ (4) Nonc

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Key Concepts

Heat of Formation

The heat of formation is the enthalpy change that occurs when one mole of a compound is formed from its constituent elements in their standard states. It is a key concept in thermochemistry and provides insight into the stability and energy content of a compound.

Stoichiometry

Stoichiometry involves using the quantitative relationships between reactants and products in a chemical reaction. In thermochemical calculations, it is essential for converting measured masses to moles in order to relate experimentally obtained energy changes to a per mole basis.

Thermochemical Calculations

Thermochemical calculations encompass the methods used to determine the energy changes associated with chemical reactions. This includes relating experimental heat data to the enthalpy change per mole by using stoichiometric conversions, which is crucial for understanding reaction energetics.

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