What is the mass percent of carbon in propanoic acid (c2h5cooh)? (the molar mass of c = 12.01, h = 1.0079, and o = 16.00.)
1. 43.20%
2. 43.79%
3. 48.64%
4. 51.56%
5. 52.41%

 The mass percent  of carbon  in propanoic acid is 48.64 % (answer 3)

  calculation

  mass percent = [(mass of carbon  in propanoic  /mass  of   propanoic) x100]

mass  of carbon in propanoic =  (12.01  x2) +  12.01 = 36.03

mass of propanoic =( 12.01 x2) +( 1.0079 x5)  +12.01 +16 +16 + 1.0079 =74.0774

mass percent = 36.03  /74.0774  x 100 = 48.64%

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

the right answer is c i just did the question.