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 %

gas

explanation:

smoke is the matter of a gas

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l