To what temperature must it be raised to triple the rms speed of its molecules?

9 times of the initial temperature must it be raised to triple the rms speed of its molecules.

Explanation:

(Root Mean Square of the molecules)

= Root mean square speed of the molecules

R = Universal gas constant=

T= Temperature in Kelvins

M = Molar mass in kg/mol

Let the initial root mean square speed of its molecules be at temperature T.

Let the final root mean square speed of its molecules be at temperature T'.

9 times of the initial temperature must it be raised to triple the rms speed of its molecules.

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.