How many moles of gold are equivalent to 1.204 × 1024 atoms?

Explanation:

It is known that the value of Avogadro's number is .

Therefore, calculate moles of gold atoms as follows.

    Moles of gold atom =

                                    =

                                    = mol

                                    = 1.99 mol

Thus, we can conclude that 1.99 mol of gold atoms are equivalent to atoms.

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.