Mole Conversions… continued



The Mole continued... 2-Step Conversions

• We have now defined a mole in terms of:

✓ Representative particles (atoms, molecules, formula units, ions)

✓ Mass (sample mass measured in grams)

✓ Volume (molar volume of a gas measured in litres)

And we have learned to convert between these units and the mole.

• Now we will convert between particles, mass and volume using the mole as an intermediate unit.

The relationships between the units and the mole are summarized in the following “Mole Map”:

[pic]

Question: Find the mass of 7.9 L carbon tetrahydride at STP.

[pic]

Question: How many formula units are in 41.6 g ammonium carbonate?

[pic]

Question: Find the number of potassium ions in 57.9 g potassium phosphate.

[pic]

Mole Conversions Worksheet

Answer the following questions and outline your “route” on the Mole Map.

1. How many iron atoms are there in a small slab of iron weighing 95.8 g?

[pic]

2. What is the mass of 3.22 x 1020 manganese atoms?

[pic]

3. How many ions of silver are in 0.0342 mol of silver oxide?

[pic]

4. What is the mass of 2.6 x 1020 molecules of sulfur dioxide?

[pic]

5. What is the mass of 5.36 mol silver carbonate?

[pic]

6. What is the volume of 26.25 g oxygen gas at STP?

[pic]

7. What is the mass in grams of 0.74 mol potassium permanganate?

[pic]

8. How many litres are in 0.82 mol carbon dioxide measured at STP?

[pic]

Answers

1. 1.03 x 1024 atoms

2. 0.029 g

3. 4.12 x 1022 atoms

4. 0.027 g

5. 1478.29 g

6. 18.375 L

7. 116.95 g

8. 18.37 L

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download