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