What is the percent-by-mass concentration of acetic acid (ch3cooh) in a vinegar solution that contains 51.80 g acetic acid in a 1.000−l solution? the density of this solution is 1.005 g/ml.

Answer : The percent-by-mass concentration of acetic acid is, 5.15 %

Explanation : Given,

Mass of acetic acid = 51.80 g

Density of solution = 1.005 g/ml

Volume of solution = 1.000 L = 1000 ml      (1 L = 1000 ml)

First we have to calculate the mass of solution.

Now we have to calculate the percent-by-mass concentration of acetic acid.

Now put all the given values in this formula, we get:

Therefore, the percent-by-mass concentration of acetic acid is, 5.15 %

Based on the diagram that shows different positions of Earth and Mars around the sun, it seems that this statement is correct:

Earth covers a greater area in position A than in position B in the same amount of time. (Covers as I understood it means "overshadowing" Mars)