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!
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.
Well, don't worry, I'm here to help bring some laughter to your chemistry troubles! Let's calculate the grams of Cl in 38.0g of CF2Cl2.
First, we need to figure out the molar mass of CF2Cl2. CF2Cl2 consists of one carbon atom (C), two fluorine atoms (F), and two chlorine atoms (Cl).
The molar masses are:
C = 12.01 g/mol
F = 18.99 g/mol
Cl = 35.45 g/mol
Now, we can calculate the molar mass of CF2Cl2 by adding up the molar masses of each element:
CF2Cl2 = (1 × C) + (2 × F) + (2 × Cl)
= (1 × 12.01) + (2 × 18.99) + (2 × 35.45)
≈ 120.92 g/mol
Now that we know the molar mass of CF2Cl2, we can calculate the number of moles in 38.0g using the formula:
moles = mass / molar mass
= 38.0g / 120.92 g/mol
≈ 0.314 moles
Since there are two chlorine atoms in one molecule of CF2Cl2, we can multiply the number of moles by 2 to get the number of moles of Cl:
moles of Cl = 0.314 moles × 2
= 0.628 moles
Lastly, we can multiply the moles of Cl by the molar mass of Cl to get the grams of Cl:
grams of Cl = moles of Cl × molar mass of Cl
= 0.628 moles × 35.45 g/mol
≈ 22.23g
So, in 38.0g of CF2Cl2, there are approximately 22.23 grams of Cl. Keep in mind that these values might be rounded, but I hope this overview brought a smile to your face!
To determine the number of grams of Cl in 38.0g of CF2Cl2, we need to calculate the molar mass of CF2Cl2 and then use stoichiometry to find the mass of Cl.
Step 1: Calculate the molar mass of CF2Cl2
The molar mass of CF2Cl2 can be calculated by adding up the atomic masses of the constituent elements:
C: 12.01 g/mol
F: 18.99 g/mol (since there are two fluorine atoms)
Cl: 35.45 g/mol
Molar mass of CF2Cl2 = 12.01 + (2 * 18.99) + 35.45 = 121.91 g/mol
Step 2: Find the molar mass of Cl
Since there is only one Cl atom in CF2Cl2, the molar mass of Cl is equal to its atomic mass, which is 35.45 g/mol.
Step 3: Use stoichiometry to find the mass of Cl
We can set up a ratio using the molar masses of CF2Cl2 and Cl:
(35.45 g Cl / 121.91 g CF2Cl2) x (38.0 g CF2Cl2) = 11.03 g Cl
Therefore, there are approximately 11.03 grams of Cl in 38.0 grams of CF2Cl2.
I understand that chemistry homework can be frustrating, but don't worry, I'm here to help you understand how to solve this problem!
To determine the number of grams of Cl in CF2Cl2 (dichlorodifluoromethane), we need to know the molar mass of CF2Cl2 and the molar mass of Cl.
1. First, let's calculate the molar mass of CF2Cl2.
- Carbon (C) has a molar mass of 12.01 g/mol.
- Fluorine (F) has a molar mass of 19.00 g/mol (multiplying by 2 because there are two fluorine atoms).
- Chlorine (Cl) has a molar mass of 35.45 g/mol (multiplying by 2 because there are two chlorine atoms).
Molar mass of CF2Cl2 = (12.01 g/mol) + 2*(19.00 g/mol) + 2*(35.45 g/mol) = 121.01 g/mol.
2. Now, we can use the molar mass of CF2Cl2 to calculate the proportion of Cl in CF2Cl2.
- The molar mass of Cl is 35.45 g/mol.
- Divide the molar mass of Cl by the molar mass of CF2Cl2 and multiply by 100 to get the percentage composition.
Percentage composition of Cl in CF2Cl2 = (35.45 g/mol / 121.01 g/mol) * 100 ≈ 29.28%.
3. Finally, we can calculate the grams of Cl in 38.0 g of CF2Cl2.
- Multiply the mass of CF2Cl2 (38.0 g) by the percentage composition of Cl (29.28%) and divide by 100.
Mass of Cl in 38.0 g of CF2Cl2 = (38.0 g) * (29.28 / 100) ≈ 11.11 g.
Therefore, there are approximately 11.11 grams of Cl in 38.0 grams of CF2Cl2.
Remember, understanding the concepts and steps involved in solving chemistry problems is crucial. If you ever feel stuck, don't hesitate to ask for assistance!