The image displays a section of a worksheet used for calculating various aspects of a hydrate sample in chemistry. It includes sections for showing work in the calculations. Below is a transcription suitable for an educational website: --- ### Calculate Mass of Hydrate in Your Sample 1. **Moles Water Lost, mol** - **Show Work:** [Space for calculations] 2. **Moles of Hydrate in Sample, mol (Eq. 1.3)** - **Show Work:** [Space for calculations] 3. **Mass of Hydrate in Sample, g** - **Show Work:** [Space for calculations] --- This worksheet assists students in performing step-by-step calculations to determine the composition and characteristics of a hydrate sample. Each section provides ample space for detailed calculations, encouraging students to understand the process fully. ### Laboratory Experiment: Determination of Hydrate Mass **Unknown Sample Number: A** **Chemicals in Unknown Mixture:** CuSO₄·5H₂O and SiO₂ **Hydrate Formula:** CuSO₄·5H₂O **Molar Mass of a Hydrate:** 249.55 g/mol #### Experimental Data 1. **Mass of Crucible (After Pre-heating):** - **Measured Mass:** 11.393 g 2. **Mass of Crucible and Unheated Sample:** - **Measured Mass:** 12.845 g - **Note:** The sample is described as *bright blue*. - **Mass of Unheated Sample Calculation:** \[ 12.845\, \text{g} - 11.393\, \text{g} = 1.452\, \text{g} \] 3. **Mass of Crucible and Sample After 1st Heating:** - **Measured Mass:** 12.497 g 4. **Mass of Crucible and Sample After 2nd Heating:** - **Measured Mass:** 12.494 g - **Difference Between 1st and 2nd Heating:** \[ 0.003\, \text{g} \] 5. **Mass of Water Lost (difference from beginning):** - **Calculation:** \[ 12.494\, \text{g} - 11.393\, \text{g} = 1.101\, \text{g} \] \[ 1.452\, \text{g} - 1.101\, \text{g} = 0.351\, \text{g} \] - **Water Loss as Gas:** \[ 0.351\, \text{g} \] --- **Conclusion:** Using these observations, you can calculate the mass of hydrate in your sample via two different methods. The precision in the repeated measurements indicates evaporative consistency, suggesting accurate determination of water loss.