Question

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

Answer 1

Step-by-step explanation:

Pair A:

Answer:

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:

Answer:

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:

Answer:

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