Question

Examples:

3. If you have 35.5 grams of aluminum, how many moles of it do you have?
4. What is the mass in grams of 1.42 moles of NaCl?
Practice Problems:
5. What is the mass in grams of 6.31 moles of copper metal?
6. You have 123 grams of carbon dioxide (CO₂). How many moles is that?
7. There are 4.85 x 1029 atoms of lead. How many moles is that?
8. There are 5.89 moles of methane gas (CH₂). How many molecules is that?
9. What is the mass in kilograms of 15.6 moles of calcium chloride (CaCl₂)?
10. You have 125 mg of table salt (NaCl). How many moles is that?

Answer 1

3. 1.32 moles

35.5 grams x 1/26.98 grams = 1.32

4. 82.98 grams

1.42 moles x 58.44 grams / 1 mole = 82.9848

Practice problems:

5. 401 grams

6. 2.79 moles

7. 805381 moles

8. 3.55 x 10^24 molecules of CH2

9. 1.73 kg of CaCl2

10. 0.005 moles of NaCl