Can anyone me to solve this question? vinegar is a dilute ethanoic acid with a molecular formula of ch3cooh. find the percentage composition by mass of carbon in ethanoic acid.

40.00 %  

Step-by-step explanation:

Let's rewrite the formula of ethanoic acid as C₂H₄O₂.

The masses of each element are:

2C = 2 × 12.01  =  24.02   u

4H = 4 × 1.008 =    4.032 u

2O = 2 × 16.00 = 32.00   u

            TOTAL = 60.05   u

% C = 24.02/60.05 × 100

% C = 0.400 × 100

% C = 40.00 %

a. a primary source combines several different accounts of an event. b. a primary source generally benefits from having been written after an event.

explanation:

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year