Determination of the Mass Percent of NH4Cl Recovered from the Mixture Use your data to make the necessary calculations. Be sure to report answers with the correct number of significant figures. Mass of evaporating dish #1 : 37.0529 Mass of evaporating dish #1 and original nample: 37.9230 1.Mass of original sample (g) 2.Mass of evaporating dish #1 and sample after subliming NH4 37.7999 3.Mass of NH4Cl(g) 4.Percent by mass of NH4Cl(%)
The Correct Answer and Explanation is :
To calculate the mass percent of NH₄Cl recovered from the mixture, we will go through the following steps, using the data provided:
Given Data:
- Mass of evaporating dish #1: 37.0529 g
- Mass of evaporating dish #1 and original sample: 37.9230 g
- Mass of evaporating dish #1 and sample after subliming NH₄Cl: 37.7999 g
Calculations:
1. Mass of the original sample:
The mass of the original sample is the difference between the mass of the evaporating dish with the original sample and the mass of the empty evaporating dish:
[
\text{Mass of original sample} = \text{Mass of dish + sample} – \text{Mass of empty dish}
]
[
\text{Mass of original sample} = 37.9230\ \text{g} – 37.0529\ \text{g} = 0.8701\ \text{g}
]
2. Mass of the sample after subliming NH₄Cl:
The mass after subliming NH₄Cl is the difference between the mass of the evaporating dish and the sample after sublimation and the mass of the empty dish:
[
\text{Mass of sample after subliming NH₄Cl} = 37.7999\ \text{g} – 37.0529\ \text{g} = 0.7470\ \text{g}
]
3. Mass of NH₄Cl recovered:
The mass of NH₄Cl recovered can be calculated by subtracting the mass of the sample after sublimation from the original mass of the sample:
[
\text{Mass of NH₄Cl recovered} = 0.8701\ \text{g} – 0.7470\ \text{g} = 0.1231\ \text{g}
]
4. Percent by mass of NH₄Cl:
The mass percent of NH₄Cl in the original sample is the mass of NH₄Cl recovered divided by the mass of the original sample, multiplied by 100:
[
\text{Percent by mass of NH₄Cl} = \left(\frac{\text{Mass of NH₄Cl recovered}}{\text{Mass of original sample}}\right) \times 100
]
[
\text{Percent by mass of NH₄Cl} = \left(\frac{0.1231\ \text{g}}{0.8701\ \text{g}}\right) \times 100 = 14.14\%
]
Final Answers:
- Mass of original sample: 0.8701 g
- Mass of evaporating dish #1 and sample after subliming NH₄Cl: 0.7470 g
- Mass of NH₄Cl recovered: 0.1231 g
- Percent by mass of NH₄Cl: 14.14%
Explanation:
The experiment involves subliming NH₄Cl from a mixture and then determining the mass percent of NH₄Cl that was recovered. By subtracting the mass of the sample after sublimation from the mass of the original sample, we can calculate the amount of NH₄Cl that was removed. The mass percent is then calculated by dividing the mass of NH₄Cl recovered by the original mass of the sample, giving us an understanding of how much of the sample was NH₄Cl.
The significant figures have been properly accounted for in each step, ensuring that the final result reflects the precision of the given data.