Answer:
THE CORRECT ANSWER IS COMMAND.HOPE IT HELP YOU
Explanation:
the solid substance which left on the filter paper is called Residue
72g H2O x 1 mol H2O/18.02g H2O = 3.99 mol H2O
The solution changed color because the substances are not neutral.
<h3>
pH</h3>
Chemical substances have different concentrations of the hydrogen cation, called PH.
The higher the pH, the more basic the substance, and the lower the more acidic.
Bromothymol blue is a pH indicator that changes its color according to the pH of the substance, yellow for acid, blue for basic and green for neutral.
In the case of the reactions in question, we have the release of CO2 (acid) in combustion and in cellular respiration, changing the color of bromothymol blue to yellow.
Learn more about pH in: brainly.com/question/491373