Question

Balance the following equations: (a) $\mathrm{Cr}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{3}(\mathrm{s})$ (b) $\mathrm{Cu}_{2} \mathrm{S}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{Cu}(\mathrm{s})+\mathrm{SO}_{2}(\mathrm{g})$ (c) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{3}(\ell)+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\ell)+\mathrm{CO}_{2}(\mathrm{g})$

Name: Problem 3, Chapter 3: Chemistry and Chemical Reactivity
Uploaded: 2020-06-04T21:55:24-08:00
Duration: 33 min 38 s
Channel: Jacquelin Ho
Description: Balance the following equations: (a) Cr(s)+O2(g) →Cr2 O3(s) (b) Cu2 S(s)+O2(g) →Cu(s)+SO2(g) (c) C6 H5 CH3(ℓ)+O2(g) →H2 O(ℓ)+CO2(g)

   Balance the following equations:
(a) $\mathrm{Cr}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{3}(\mathrm{s})$
(b) $\mathrm{Cu}_{2} \mathrm{S}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{Cu}(\mathrm{s})+\mathrm{SO}_{2}(\mathrm{g})$
(c) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{3}(\ell)+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\ell)+\mathrm{CO}_{2}(\mathrm{g})$

Chemistry and Chemical Reactivity

John C. Kotz, Paul… 9th Edition

Chapter 3, Problem 3

Instant Answer

Solved by Expert Jacquelin Ho

06/04/2020

Step 1

Let's start with the chromium (Cr) atoms. There is 1 Cr atom on the left side and 2 Cr atoms on the right side. To balance this, we can put a coefficient of 2 in front of Cr on the left side: $2\mathrm{Cr}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow Show more…

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Balance the following equations: (a) $\mathrm{Cr}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{Cr}_{2} \mathrm{O}_{3}(\mathrm{s})$ (b) $\mathrm{Cu}_{2} \mathrm{S}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{Cu}(\mathrm{s})+\mathrm{SO}_{2}(\mathrm{g})$ (c) $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{3}(\ell)+\mathrm{O}_{2}(\mathrm{g}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\ell)+\mathrm{CO}_{2}(\mathrm{g})$

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Key Concepts

Balancing Chemical Equations

Balancing chemical equations is the process of adjusting coefficients to ensure that the number of atoms for each element is the same on both the reactant and product sides, thereby satisfying the law of conservation of mass and accurately representing the stoichiometry of the reaction.

Stoichiometry

Stoichiometry involves the quantitative relationships of the elements and compounds involved in a chemical reaction. It uses the mole concept and coefficients in balanced equations to represent the proportions in which reactants combine and products form.

Law of Conservation of Mass

The law of conservation of mass states that in a chemical reaction, matter is neither created nor destroyed. This principle requires that for every element, the number of atoms in the reactants must equal the number in the products, which is the foundation for balancing chemical equations.

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