How can we determine the actual percentage of h2o2 in a drugstore bottle of hydrogen peroxide?

Measuring the volume of oxygen released

Explanation:

The hydrogen peroxide has a decomposition reaction:

So, if we leave this reaction happen and we capture the oxygen released measuring its volume we can determine the percentage of peroxide.

Where:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.