For each pair below, select the sample that contains the largest number of moles.

pair a

2.50 g o2
a. n.s: 2.50 g n2

pair b
21.5 g n2
a. n.s: 15.2 g co2

pair c
0.054 g o2
a. n.s: 0.081 co2

Explanation:

Pair A:

nitrogen

Moles of oxygen:

Number of moles = mass/ molar mass

Number of moles = 2.50 g/ 32 g/mol

Number of moles = 0.08 mol

Moles of nitrogen:

Number of moles = mass/ molar mass

Number of moles = 2.50 g/ 28 g/mol

Number of moles = 0.09 mol

Pair B:

nitrogen

Moles of nitrogen:

Number of moles = mass/ molar mass

Number of moles = 21.50 g/ 28 g/mol

Number of moles = 0.77 mol

Moles of carbon dioxide:

Number of moles = mass/ molar mass

Number of moles = 15.2 g/ 44 g/mol

Number of moles = 0.341 mol

Pair C:

Both have same number of moles.

Moles of oxygen:

Number of moles = mass/ molar mass

Number of moles = 0.054 g/ 32 g/mol

Number of moles = 0.002 mol

Moles of carbon dioxide:

Number of moles = mass/ molar mass

Number of moles = 0.081 g/ 44 g/mol

Number of moles = 0.002 mol

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.

hurricanes form in warm water