Grade 9 Chemistry practice

What is on the worksheet

1. A model sample has mass 12 g and stated molar mass 15 g/mol. Find its amount. Round to 3 decimal places if needed. Answer in mol.

2. A sample contains 1.6 mol and has stated molar mass 113 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.

3. A model solution contains 1.3 mol in a final volume of 1.27 L. Find its molar concentration. Round to 3 decimal places if needed. Answer in mol/L.

4. A model sample has mass 22 g and stated molar mass 156 g/mol. Find its amount. Round to 3 decimal places if needed. Answer in mol.

5. A 40 g sample is 96% desired substance by mass. Find the desired substance mass. Round to 3 decimal places if needed. Answer in g.

6. A model sample has mass 174 g and stated molar mass 69 g/mol. Find its amount. Round to 3 decimal places if needed. Answer in mol.

7. The theoretical dry pure product mass is 92 g; the actual dry pure product mass is 76 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.

8. An aqueous solution has concentration 1.2 mol/L. A model aliquot has volume 368 mL. Find the solute amount. Round to 3 decimal places if needed. Answer in mol.

9. A sample contains 3.1 mol and has stated molar mass 97 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.

10. The theoretical dry pure product mass is 101 g; the actual dry pure product mass is 49 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.

11. Measured from the same origin, a spot travels 42 mm and the solvent front 80 mm. Find Rf. Round to 3 decimal places if needed.

12. A 72 mL aliquot at 0.4 mol/L is diluted to 360 mL total without reaction or loss. Find the final concentration. Round to 3 decimal places if needed. Answer in mol/L.

13. The theoretical dry pure product mass is 87 g; the actual dry pure product mass is 14 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.

14. A sample contains 3.4 mol and has stated molar mass 105 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.

15. Measured from the same origin, a spot travels 14 mm and the solvent front 36 mm. Find Rf. Round to 3 decimal places if needed.

16. A model solution contains 19 g solute and 120 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.

17. A model solution contains 1.3 mol in a final volume of 0.76 L. Find its molar concentration. Round to 3 decimal places if needed. Answer in mol/L.

18. A model solution contains 1.1 mol in a final volume of 1.7 L. Find its molar concentration. Round to 3 decimal places if needed. Answer in mol/L.

19. A sample contains 2.1 mol and has stated molar mass 85 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.

20. The theoretical dry pure product mass is 97 g; the actual dry pure product mass is 77 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.