Rubbing Alchol often contains propanol, C3H7OH. Suppose that you have an 85.9g sample of propanol.
a) Howmany carbon atoms are in the sample?
b) Howmany hydrogen atoms are in the sample?
C)Howmany oxygen atoms are in the sample?
PLEASE!! explain the steps to me...I don't know how to get the answe for these questions.
Thankyou! Your help is appreciated!:)
Calculate the number of moles of C3H7OH in 85 grams. One mole is 60 g.
So you have 85/60 = 1.417 moles
Multiply that by Avogadro's number for the number of propanol molecules.
Each molecule contains 3 C atoms, 8 H atoms and 1 O atom.
How do you know one mole is 60grams..and by 85 you mean 85.9grams right?
And how do you calculate the number of moles of C3H7OH in 85.9grams?
Please explain the steps to me....
You have apparently not learned how to compute the molecular weight of a compound. Here's how: Add up the atomic weights of all atoms in the molecule. For C3H7OH, that is (12*3) + (7*1) + 16 + 1 = 60.
I used 1 for the atomic weight of H. Actually it is 1.008. A more accurate molecular weight of propanol is 60.0064
Yes, the 85 should have been 85.9
There are 85.9/60.0064 = 1.4315 moles
The remaining steps have already been explained.
But then how do you get the atoms of each individual element...can you please explain that part... Im sorry...
Get them from the chemical formula. In this case, it is C3H7OH. There are 3 carbon atoms, one O and eight H's in that formula.
To find the number of carbon atoms in the sample of propanol, we need to know the molar mass of propanol and the number of carbon atoms in one molecule of propanol.
a) To calculate the number of carbon atoms in the sample, we will use the following steps:
Step 1: Find the molar mass of propanol (C3H7OH)
The molar mass of carbon (C) is 12.01 g/mol.
To calculate the molar mass of C3H7OH:
3 (C) + 8 (H) + 16 (O) = 60.10 g/mol.
Step 2: Calculate the number of moles of propanol in the sample.
Number of moles = mass of sample / molar mass
Number of moles = 85.9 g / 60.10 g/mol ≈ 1.43 mol.
Step 3: Calculate the number of carbon atoms.
Each molecule of propanol (C3H7OH) contains three carbon atoms.
Number of carbon atoms = number of moles × number of carbon atoms per molecule
Number of carbon atoms = 1.43 mol × 3 = 4.29 ≈ 4 carbon atoms.
Therefore, there are approximately 4 carbon atoms in the sample.
b) To find the number of hydrogen atoms in the sample, we will use a similar approach.
Step 1: Calculate the total number of hydrogen atoms in one mole of propanol.
One molecule of propanol (C3H7OH) contains seven hydrogen atoms.
Step 2: Calculate the number of hydrogen atoms in the sample.
Number of hydrogen atoms = number of moles × number of hydrogen atoms per molecule
Number of hydrogen atoms = 1.43 mol × 7 = 10.01 ≈ 10 hydrogen atoms.
Therefore, there are approximately 10 hydrogen atoms in the sample.
c) To find the number of oxygen atoms in the sample, we will use the same approach as above.
Step 1: Calculate the total number of oxygen atoms in one mole of propanol.
One molecule of propanol (C3H7OH) contains one oxygen atom.
Step 2: Calculate the number of oxygen atoms in the sample.
Number of oxygen atoms = number of moles × number of oxygen atoms per molecule
Number of oxygen atoms = 1.43 mol × 1 = 1.43 ≈ 1 oxygen atom.
Therefore, there are approximately 1 oxygen atom in the sample.
In summary:
a) The sample contains approximately 4 carbon atoms.
b) The sample contains approximately 10 hydrogen atoms.
c) The sample contains approximately 1 oxygen atom.