Question

Which of the following samples has the greatest mass of iron? (2 points) Question 32 options: 1) 3.8 mol Fe 2) 7.0 × 1023 atoms Fe 3) 42.0 g Fe 4) 1.8 mol Fe

Answer 1

Answer:

Sample 1

Step-by-step explanation:

To answer this question we must convert all the samples to grams.

1) To convert the first sample we multiply the amount of moles by the molar mass of iron to get the mass.

3.8 mol Fe x 55.85g/mol = 212.23g Fe

2) To convert the second sample to grams we must first convert from atoms to moles. We do this by riding the amount of atoms by Avagadro’s number. We then multiply the amount of moles by the molar mass of iron.

7.0 x 10^23atoms Fe / 6.02 x 10^23 = 1.2mol Fe

1.2mol Fe x 55.85g/mol = 64.94g Fe

3) Sample 3 is already listed in grams therefore we don’t need to convert it.

4) To convert sample 4 to grams we must multiply the amount of moles by the molar mass of iron to get the mass.

1.8mol Fe x 55.85g/mol = 100.53g Fe

Sample 1 has greatest mass of iron at 212.23g Fe.