Asked by Luis
How many grams of Cl are in 38.0g of CF2Cl2? I really want to figure out how to do it. I can't seem to understand any of this Chem homework and it's getting me frustrated, please help!
Answers
Answered by
DrBob222
You work through these things logically. The best advice I have for beginning students is to think "moles".
How many mols CF3Cl2 are in 38.0 g. I will estimate all of these numbers; you should do them more accurately.
mols = grams/molar mass = 38/121 = approx 0.3
mols Cl in CF2Cl2 is twice that because there are 2 Cl atoms in 1 molecule of CF2Cl2. So mols Cl atoms is about 0.6
Then convert mols to g. g = mols x atomic mass = 0.6 x 35.5 = about 22 g Cl.
There is a shortcut you can use when talking about the mass of something in the SAME molecule. That is
38g x (mass of 2Cl/mass CF2Cl2) = 38 x (2*35.5/121) = about 22.
Basically this last method is just a percent problem.
%Cl in CF2Cl2 = (2*mass Cl/mass CF2Cl2)*100 = (235.5/121)*100 = about 58.7%
Then 38g x 0.587 = about 22 g.
How many mols CF3Cl2 are in 38.0 g. I will estimate all of these numbers; you should do them more accurately.
mols = grams/molar mass = 38/121 = approx 0.3
mols Cl in CF2Cl2 is twice that because there are 2 Cl atoms in 1 molecule of CF2Cl2. So mols Cl atoms is about 0.6
Then convert mols to g. g = mols x atomic mass = 0.6 x 35.5 = about 22 g Cl.
There is a shortcut you can use when talking about the mass of something in the SAME molecule. That is
38g x (mass of 2Cl/mass CF2Cl2) = 38 x (2*35.5/121) = about 22.
Basically this last method is just a percent problem.
%Cl in CF2Cl2 = (2*mass Cl/mass CF2Cl2)*100 = (235.5/121)*100 = about 58.7%
Then 38g x 0.587 = about 22 g.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.