4 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Checking How Much Salt a Hydrate Delivers 4 questions
Checking How Much Salt a Hydrate Delivers
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A classroom solution model can use anhydrous copper(II) sulfate, CuSO4, or its pentahydrate, CuSO4·5H2O. One formula unit of the pentahydrate supplies one CuSO4 unit when dissolved. In the drying model the pentahydrate loses all five waters and no CuSO4.
| Packet | Solid | Sample mass (g) | Model molar mass (g/mol) |
|---|---|---|---|
| P | CuSO4·5H2O | 5.00 | 250 |
| Q | CuSO4 | 5.00 | 160 |
Question 1
Which packet supplies more moles of CuSO₄ when the entire packet is dissolved?
- P only
- Q only
- They supply equal amounts.
- The measurements cannot distinguish the amounts.
Question 2
Calculate the mass of anhydrous CuSO₄ remaining after all water is removed from P.
Write your answer and work on the printable worksheet, or answer online.
The class receives an 8.00 g sample labeled pure pentahydrate. It dries the sample fully and recovers 6.40 g of CuSO4. No solid is lost.
Question 3
Evaluate the label using the result expected for a pure pentahydrate sample.
Write your answer and work on the printable worksheet, or answer online.
Question 4
Find the amount of CuSO₄ the unknown sample actually delivers in solution. Use the dried mass rather than the label.
Write your answer and work on the printable worksheet, or answer online.
2025 Chemistry Reference Tables · Browse Chemistry worksheets