At high temperatures, sulfur combines with iron to form the brown-black iron (II) sulfide:
Fe (s) + S (l)--> FeS (s)
How do you calculate the mass of FeS formed?
Thank you!
Here is a worked example of a stoichiometry problem. You will have many of these in a chemistry course. Bookmark this page so you can refer to it as needed. Most stoichiometry problems are alike.
http://www.jiskha.com/science/chemistry/stoichiometry.html
To calculate the mass of FeS formed in the reaction, you need to use the concept of stoichiometry, which relates the coefficients of the balanced equation to the number of moles of each substance involved.
Here's how you can calculate the mass of FeS formed:
1. Determine the molar mass of each substance involved in the reaction. The molar masses for Fe and S are available on the periodic table: Fe = 55.845 g/mol, and S = 32.06 g/mol.
2. Write down the balanced chemical equation, which is:
Fe (s) + S (l) → FeS (s)
From the equation, you can see that the ratio of Fe to FeS is 1:1. This means that for every 1 mole of Fe, you will get 1 mole of FeS.
3. Find the molar mass of FeS by adding the molar masses of its individual elements:
FeS = (1 mol of Fe) × (55.845 g/mol) + (1 mol of S) × (32.06 g/mol)
Calculate this using the molar masses given:
FeS = 55.845 g/mol + 32.06 g/mol
FeS = 87.905 g/mol
This means that 1 mole of FeS has a mass of 87.905 grams.
4. To calculate the mass of FeS formed, you will need to know the quantity of Fe involved in the reaction. For example, let's assume you have 10 grams of Fe.
5. Convert the mass of Fe to moles using the molar mass of Fe:
Moles of Fe = (10 g of Fe) / (55.845 g/mol)
Calculate the moles of Fe:
Moles of Fe = 0.179 moles
6. Using stoichiometry, we know that 1 mole of Fe will produce 1 mole of FeS. Therefore, the moles of FeS formed will also be 0.179 moles.
7. To find the mass of FeS formed, multiply the mole quantity by the molar mass of FeS:
Mass of FeS = (0.179 moles) × (87.905 g/mol)
Calculate the mass of FeS:
Mass of FeS = 15.72 grams
Therefore, when you start with 10 grams of Fe, you can expect to produce approximately 15.72 grams of FeS.