How many grams are in 4.80 mol of sodium chloride (nacl)?

Sodium has a molar mass of 23 while Cl has molar mass of 35.45, therefore the molar mass of NaCl sodium chloride is 58.44 g / mol, so the mass in grams is:

mass NaCl = 58.44 g / mol * 4.8 mol

mass NaCl = 280.51 grams

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.

the answer is option a.