Suppose 12.0 g of carbon (C) reacts with 70.0 g of sulfur (S) to give 76.0 g of the compound

Name: Problem 28, Chapter 3: Introductory Chemistry Atoms First
Uploaded: 2022-02-22T13:53:48-08:00
Duration: 4 min 34 s
Channel: Susan Hallstrom

step 1 In this problem, we're given the following information. 12 .0 grams of carbon reacts with 70. I'

Question

Suppose $12.0 \mathrm{~g}$ of carbon (C) reacts with $70.0 \mathrm{~g}$ of sulfur (S) to give $76.0 \mathrm{~g}$ of the compound carbon disulfide $\left(\mathrm{CS}_{2}\right) .$ In the process, all the carbon gets used up, but some elemental sulfur is left over. (a) For the law of conservation of matter to be obeyed, how much sulfur is unused? (b) What is the percent $C$ in $\mathrm{CS}_{2} ?$ (c) What is the percent $S$ in $C S_{2}$ ? (d) What is the sum of the $\% \mathrm{C}$ and $\% \mathrm{~S}$ in $\mathrm{CS}_{2} ?$

    Suppose $12.0 \mathrm{~g}$ of carbon (C) reacts with $70.0 \mathrm{~g}$ of sulfur (S) to give $76.0 \mathrm{~g}$ of the compound carbon disulfide $\left(\mathrm{CS}_{2}\right) .$ In the process, all the carbon gets used up, but some elemental sulfur is left over.
(a) For the law of conservation of matter to be obeyed, how much sulfur is unused?
(b) What is the percent $C$ in $\mathrm{CS}_{2} ?$
(c) What is the percent $S$ in $C S_{2}$ ?
(d) What is the sum of the $\% \mathrm{C}$ and $\% \mathrm{~S}$ in $\mathrm{CS}_{2} ?$

Introductory Chemistry Atoms First

Steve Russo; Mike… 5th Edition

Chapter 3, Problem 28

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Solved by Expert Susan Hallstrom

02/22/2022

Step 1

0 g of carbon reacts with 70.0 g of sulfur to give 76.0 g of carbon disulfide (CS2). All the carbon gets used up, but some sulfur is left over. According to the law of conservation of matter, the total mass of the reactants should be equal to the total mass of the Show more…

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Suppose $12.0 \mathrm{~g}$ of carbon (C) reacts with $70.0 \mathrm{~g}$ of sulfur (S) to give $76.0 \mathrm{~g}$ of the compound carbon disulfide $\left(\mathrm{CS}_{2}\right) .$ In the process, all the carbon gets used up, but some elemental sulfur is left over. (a) For the law of conservation of matter to be obeyed, how much sulfur is unused? (b) What is the percent $C$ in $\mathrm{CS}_{2} ?$ (c) What is the percent $S$ in $C S_{2}$ ? (d) What is the sum of the $\% \mathrm{C}$ and $\% \mathrm{~S}$ in $\mathrm{CS}_{2} ?$

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Key Concepts

Percent Composition

Percent composition is the method used to determine the percentage by mass of each element within a compound. This concept is essential for understanding the makeup of the compound as well as for performing calculations related to reactant consumption and product yield.

Law of Conservation of Matter

This principle states that in a closed system, the total mass of the reactants equals the total mass of the products after a chemical reaction. It is used to account for any excess reactants that do not participate in the reaction, ensuring that the overall mass remains constant before and after the reaction.

Stoichiometry

Stoichiometry involves calculating the quantities of reactants and products in chemical reactions based on the conservation of mass and the balanced chemical equation. It allows one to determine, for example, how much of an element is consumed or left over in a reaction.

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