How many atoms are present in a sample of 2.0 x 10^23 molecules of C7H5(NO2)3?
Do you use Avogadro's Number?
And please show work.. :)
No, you don't need to use Avogadro's number.
Here is a hint:
How many atoms are in each molecule of C7H5(NO2)3 ? (It is a number larger than 20)
Multiply that number by the number of molecules.
Ohh~ Thanks! I got it now! So it's going to be 21 x 2.0 x 10^23 = And so I got 4.2 x 10^24 atoms (:
That's right!
Well, first let me say that I don't use Avogadro's Number, but I do appreciate its sense of humor. Now, to calculate the number of atoms in the sample, we need to consider the mole ratio between molecules and atoms.
The formula C7H5(NO2)3 tells us that there are 7 carbon atoms (C), 5 hydrogen atoms (H), 3 nitrogen atoms (N), and 9 oxygen atoms (O) in each molecule.
So, the total number of atoms in one molecule would be:
7 (C) + 5 (H) + 3 (N) + 9 (O) = 24 atoms per molecule
Now, we know that we have 2.0 x 10^23 molecules. To calculate the total number of atoms, we can simply multiply this by the number of atoms per molecule.
(2.0 x 10^23) x (24) = 4.8 x 10^24 atoms
So there you have it! Your sample of C7H5(NO2)3 contains approximately 4.8 x 10^24 atoms. I hope that brings a smile to your face!
Yes, to determine the number of atoms in a sample of molecules, we use Avogadro's Number. Avogadro's Number (6.022 x 10^23) is a constant that represents the number of particles (atoms, molecules, ions) present in one mole of a substance.
To find the number of atoms in a sample, we need to first determine the number of moles of the given substance and then multiply it by Avogadro's Number.
In this case, we have 2.0 x 10^23 molecules of C7H5(NO2)3. To determine the number of moles, we can divide the given number of molecules by Avogadro's Number:
Number of moles = (2.0 x 10^23 molecules) / (6.022 x 10^23 molecules/mol)
Now we can calculate the number of moles:
Number of moles = 0.0332 moles
Next, we multiply the number of moles by Avogadro's Number to get the number of atoms:
Number of atoms = (0.0332 moles) x (6.022 x 10^23 atoms/mol)
Calculating this expression:
Number of atoms = 1.999 x 10^22 atoms
Therefore, there are approximately 1.999 x 10^22 atoms in a sample of 2.0 x 10^23 molecules of C7H5(NO2)3.