Calculate the total number of F (Fluorine) atoms in 12.15 mol C2HBrClF3. The answer is 2.195 x 10^25 atoms, but I am not sure how they got there. Can anyone give me a hint how to get started?

If needed (i'm not sure), the moleculatr mass of C2HBrClF3 is 197.381.

Just use dimensional analysis to see how it works. There are 6.02 x 10^23 molecules in a mole of molecules and there are 3 F atoms in the C2HBrClF3 molecule. So start with what you have and use factors to get where you want to go.

12.15 moles Cx x factor x factor = # F atoms.
12.15 moles Cx x (6.02 x 10^23 molecules Cx/1 mol Cx) x (3 F atoms/1 molecule Cx) = ??
Note that moles Cx (in the 12.15) cancel with the mol Cx in the first factor and molecules Cx in the numerator of the first factor cancel with molecules Cx in the denominator of factor 2, leaving F atoms which is the unit you want to keep.

Alright, now I am starting to understand. Thanks!

yes tu

Hi!!, One question, why don´t you use the molecular atomic mass of C2HBrClF3 as a factor?

Well, let's break it down step by step, shall we?

First, find the number of moles of Fluorine (F) in 1 mole of C2HBrClF3.

To do this, we need to look at the chemical formula of C2HBrClF3 and count how many F atoms are present. In this case, there is only 1 F atom in C2HBrClF3.

So, the number of moles of F in 1 mole of C2HBrClF3 is 1.

Next, calculate the number of moles of F in 12.15 mol of C2HBrClF3.

To do this, multiply the number of moles of F in 1 mole of C2HBrClF3 (which is 1) by the number of moles of C2HBrClF3 given (12.15 mol).

So, the number of moles of F in 12.15 mol of C2HBrClF3 is also 12.15 mol.

Finally, convert the number of moles of F to the total number of atoms of F.

To do this, multiply the number of moles of F (12.15 mol) by Avogadro's number (6.022 x 10^23 atoms/mol).

So, the total number of F atoms in 12.15 mol of C2HBrClF3 is approximately 7.31 x 10^24 atoms.

Hmm, it seems like the answer I got is different from the one you mentioned (2.195 x 10^25 atoms). Maybe someone can double-check the calculations. Or perhaps a comedic miracle occurred in the calculation process.

To calculate the total number of Fluorine (F) atoms in 12.15 mol of C2HBrClF3, we need to use Avogadro's number and the molar ratio between F atoms and C2HBrClF3 molecules. Here's a step-by-step explanation to help you get started:

1. Determine the molar mass of C2HBrClF3.
Given: Molecular mass of C2HBrClF3 = 197.381 g/mol

2. Calculate the number of moles of C2HBrClF3.
Given: Moles of C2HBrClF3 = 12.15 mol

3. Use Avogadro's number to convert moles of C2HBrClF3 to molecules of C2HBrClF3.
Avogadro's number = 6.022 x 10^23 molecules/mol

Number of C2HBrClF3 molecules = Moles of C2HBrClF3 x Avogadro's number

4. Determine the ratio of F atoms to C2HBrClF3 molecules.
In one molecule of C2HBrClF3, there are 3 F atoms.

Ratio of F atoms to C2HBrClF3 molecules = 3 F atoms / 1 C2HBrClF3 molecule

5. Multiply the number of C2HBrClF3 molecules by the ratio of F atoms to C2HBrClF3 molecules to get the total number of F atoms.
Total number of F atoms = Number of C2HBrClF3 molecules x Ratio of F atoms to C2HBrClF3 molecules

Now, let's compute the total number of F atoms:

6. Calculate the number of C2HBrClF3 molecules:
Number of C2HBrClF3 molecules = 12.15 mol x (6.022 x 10^23 molecules/mol)

(Note: The mole units cancel out, leaving us with molecules.)

7. Multiply the number of C2HBrClF3 molecules by the ratio of F atoms to C2HBrClF3 molecules:
Total number of F atoms = Number of C2HBrClF3 molecules x (3 F atoms / 1 C2HBrClF3 molecule)

8. Simplify the expression:
Total number of F atoms = Number of C2HBrClF3 molecules x 3 F atoms

9. Calculate the final result:
Total number of F atoms = (12.15 mol x (6.022 x 10^23 molecules/mol)) x 3

This calculation yields the answer of 2.195 x 10^25 F atoms.

So, by using Avogadro's number and the molar ratio, we can determine the total number of F atoms in 12.15 mol of C2HBrClF3.