Jessica has 12.7 moles of a compound for an experiment. how many particles of the compound does she have? a. 2.11 × 1023 b. 4.74 × 1023 c. 7.65 × 1023 d. 4.74 × 1024 e. 7.65 × 1024

Number of moles is defined as the ratio of given mass in g to the molar mass.

The mathematical expression is given as:

Number of moles  =

Number of moles of compound  = 12.7 moles (given)

As, 1 mole of any compound is equal to particles.

where,    is Avogadro number.

Formula for calculating particles is given by:

where, N =  number of particles, n = number of moles and is Avogadro number.

Put the values,

= or  

Hence, number of particles of the compound is equal to

what's the

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.