Asked by Gale
Rubbing alcohol often contains propanol, C3H7OH. Suppose you have an 85.9 g sample.
a) How many carbon atoms are in the sample?
b) How many hydrogen atoms are in the sample?
c) How many oxygen atoms are in the sample?
For a, I have tried dividing 85.9 by the total mass, 60.09502, which gave me 1.429409069.After this, I multiplied by Avagadro's constant, 6.02 x 10^23, which gave me the total atoms in propanol. However, I am not sure how to find the atoms in each individual element.
a) How many carbon atoms are in the sample?
b) How many hydrogen atoms are in the sample?
c) How many oxygen atoms are in the sample?
For a, I have tried dividing 85.9 by the total mass, 60.09502, which gave me 1.429409069.After this, I multiplied by Avagadro's constant, 6.02 x 10^23, which gave me the total atoms in propanol. However, I am not sure how to find the atoms in each individual element.
Answers
Answered by
Damon
How many molecules do you have?
Well how much mass in a mol?
3*12 + 7*1 + 16 + 1 = 60 grams for 6.022*10^23 molecules
so
we have
6.022*10^23 * 85.9/60
= 8.62*10^23 molecules
each of those molecules has 3 carbon atoms
3*8.62*10^23 = 25.9 *10^23
=2.59 * 10^24 carbon atoms
Well how much mass in a mol?
3*12 + 7*1 + 16 + 1 = 60 grams for 6.022*10^23 molecules
so
we have
6.022*10^23 * 85.9/60
= 8.62*10^23 molecules
each of those molecules has 3 carbon atoms
3*8.62*10^23 = 25.9 *10^23
=2.59 * 10^24 carbon atoms
Answered by
Gale
Why would you multiply that number by 3?
Answered by
DrBob222
Look at the formula of C3H7OH. For every molecule of C3H7OH, you have 3 C atoms. Multiply by 8 to find the number of H atoms and multiply by 1 for find O atoms.