How Much Chromium(III) Oxide Is Needed for 439g of Chromium Sulfide?

Cr2O3 by its formula weight.In summary, to produce 439g of Cr2S3, 1 mole of Cr2O3 is required. This can be calculated by using the mole:mole ratio of 1:1 for the reaction between Chromium(III) Oxide and Hydrogen Sulfide gas. To find the formula weight of Cr2O3, first identify the relevant compounds and their formula weights. Then, for part A, calculate the number of moles of Cr2O3 in 439g of Cr2S3, and for part B, multiply the number of moles by the formula weight to find the required grams of Cr2O3
  • #1
triplepie
15
0
1. Chromium(III) Oxide reacts with Hydrogen Sulfide(H2S) gas to form Chromium Sulfide and water.

CR2O3(s) + H2S(g) = Cr2S3(s) + H2O (l)

to produce 439g of Cr2S3.

a. How many moles of Cr2O3 are required?

b. How many grams of CR2O3 are required?



2. Not sure how to set this up



3. All I could think of was finding the total grams of CR2O3 and dividing it from 439g's to find part a, but I think I was wrong
 
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  • #2
Identify the ratios from the written reaction. Calculate the formula weights for the relevant compounds.
 
  • #3
For part A: Find out how moles of Cr2S3 are in 439 g and the answer is how many moles of Cr2O3 because the mole:mole ratio is 1:1.

For part B: Calculate how many grams of Cr2O3 are in your answer to part a
 

1. What is stoichiometry in chemistry?

Stoichiometry is the study of the quantitative relationships between the reactants and products in a chemical reaction. It involves determining the amount of substances that are involved in a reaction and predicting the amounts of products that will be formed.

2. Why is stoichiometry important in chemistry?

Stoichiometry is important in chemistry because it allows us to understand and predict the outcome of chemical reactions. It also helps in determining the correct amounts of reactants to use in order to obtain the desired amount of products.

3. What are the basic steps for solving stoichiometry problems?

The basic steps for solving stoichiometry problems are:
1. Write a balanced chemical equation for the reaction.
2. Determine the given and unknown quantities.
3. Convert the given quantities to moles, if necessary.
4. Use the mole ratio from the balanced equation to calculate the moles of the unknown substance.
5. Convert the moles of the unknown substance to the desired units, if necessary.

4. What is the mole ratio and how is it used in stoichiometry?

The mole ratio is the ratio of the number of moles of one substance to the number of moles of another substance in a balanced chemical equation. It is used in stoichiometry to convert between different substances in a reaction, allowing us to determine the amount of product that will be produced.

5. Can stoichiometry be used for all types of chemical reactions?

Stoichiometry can be used for most types of chemical reactions, but it is most accurate for reactions that occur in a controlled environment, such as in a laboratory setting. Some reactions, such as those that involve gases or multiple steps, may require additional calculations to accurately determine the amounts of products formed.

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