Question

The percent composition of acetic acid, HC2H3O2, is:

20% carbon, 2% hydrogen, 27% oxygen

40% carbon, 7% hydrogen, 53% oxygen

23% carbon, 7% hydrogen, 70% oxygen

Cannot be determined from the information given

I have no idea, @sweetburger can you help?

Answer 1

So percent composition is basically composition by mass. The total mass of acetic acid is 60.05 grams. I will do Hydrogen for you There are 4 hydrogens in acetic acid so 4*(molar mass of Hydrogen) / 60.05 so it would be roughly 4/60 x 100% = 6.5% H which rounds up to 7% Hydrogen. Just repeat the process with O and C.

Answer 2

so how many carbons are in acetic acid?

Answer 3

@sweetburger

Answer 4

2

Answer 5

so 3 carbon?

Answer 6

no only 2 carbons

Answer 7

2 oxygen as well

Answer 8

i means like 3% of carbon

Answer 9

2/60 = 1/30 *100 = roughly 3%

Answer 10

noo its molar mass of 2 carbons divided by the total molar mass of aceitic acid so like 24/60

Answer 11

wait what

Answer 12

mass composition is the finding what percent by mass does a single type of atom make up a compound. For example NaCl the Na atom does not make up 50% of this compounds mass instead it makes up (mass of Na)/(mass of NaCl) = roughly 40% Na by mass

Answer 13

so carbon would be 24 (ish)
then it would be 40%

Answer 14

yes exactly

Answer 15

so B would be the answer right?

Answer 16

Yea looks like it