How many moles of au atoms are in 2.56 gm

hey there:

Molar mass of Au = 196.96 g/mol

Therefore:

moles of Au atoms = mass Au / molas mass

moles of Au atoms = 2.56 / 196.96

moles of Au atoms = 0.0123 moles

Hope that helps!

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.