Please help with these two chemistry questions. Image attached.

The answer to your question is below

Explanation:

Question 2.

The molar mass is found by taking 2 x the molar mass of K, plus 1 x the molar mass of sulfur, plus 4 x the molar mass of oxygen.

Question 3.

molar mass H₂O₂ = (1 x 2) + (16 x 2)

                             = 2 + 32

                             = 34.02 g

Use proportions to find the number of moles

                         34.02 g of H₂O₂ 1 mol

                            4 g                     x

                            x = (4 x 1)/34.02

                            x = 4/34.02

                            x = 0.1175 ≈ 0.118 moles              

0.118 moles

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.