You make your potassium dichromate solution and titrate it with ferrous ammonium sulfate, hexahydrate made by dissolving 0.5274 g in 200 ml of di water. you pipette 50 ml and perform 4 titrations and record the following ml of potassium dichromate to titrate to a purple endpoint: 32.17, 31.89, 32.02, 31.88 ml. you then weight out 4 iron samples: 0.4063, 0.4089, 0.4153, 0.4202 g and titrate with the potassium dichromate solution to a purple endpoint using the following ml: 23.17, 23.86, 24.09, 28.55 ml. perform all necessary calculations and report the average molarity of the standard, sd, and rsd. also, report the %fe, sd, and rsd.

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.

fe 55.85 g/mol and h2o 18.02 g/mol.