## Answers to the Practice Problems

1. Answer = 70%
a. actual yield = 33g
Predicted yield =
1. grams/ GFW or 22.8/(23+34.45) = .3900769889
2. times the ratio (.3900769889)(1) = .3900769889
3. Times the GFW of the resuting compound (.3900769889)(23+1+32+4(16)) = 46.80923867
4. Actual/theorectical = 33/46.80923867 = .7049890351
5. x 100 = (.7049890351)(100) = 70.49890351% or 70%
70% is the percentage yield

2. Answer = 1.4 grams
1. grams/GFW or 4.17g/32GFW = .1303125
2. times the ratio 3:2 or 1:2/3 = (2/3)(.1303125) = .086875
3. Times the GFW of the resulting compound = (.086875)(44) = 3.8225 is the theorectical yield
4. Actual/Theorectical = percantage
5. x/3.8225 = 36.5/100
6. x = (3.8225)(.365) = 1.3952125 or 1.4
1.4g is the actual yield

3. Answer = 3.4 grams
1. grams/GFW or 12.4g/32GFW = .3875
2. times the ratio 11:8 1:8/11 = (8/11)(.3875) = .2818181818
3. times the GFW of the resulting compound = (.2818181818)(18) = 5.072727273
4. Actual/theorectical = percentage
5. x/5.072727273 = 66.6/100
6. x = (.666)(5.072727273) = 3.378436364 or 3.4
3.4g is the actual yield

4. Answer = 31.6%
a. Actual = .428 grams
1. grams/GFW or 3.61g/32GFW = .1128125
2. times the ratio 9:6 or 1:6/9 = (6/9)(.1128125) = .0752083333
3. times the GFW of the resulting compoudn = (.0752083333)(18)
4. Actual/theorectical = percentage
5. .428/1.35375 = percentage
6. .3161588181 x 100 = percentage
31.6% is the percentage yield

5. Answer = 82.9%
a. Actual = 84.9 grams
1. grams/GFW or 72.5 g/34 GFW = 2.132352941
2. times the ratio 2:3 or 1:3/2 = (3/2)(2.132352941) = 3.198528412
3. times the GFW of the resulting compound = (3.198528412)(32) = 102.3529412 grams
4. Actual/Theorectical = percentage
5. 84.9 grams/102.3529412 grams = percentage
6. percentage = .8294827586 x 100
82.9% is the percentage yield

6. Answer = 40.9%
a. Actual = 7.18 grams
1. grams/GFW or 55.7g/(6(12)+5(1)+35.45)GFW = .4953312583
2. times the ratio 4:2 or 1:1/2 = 1/2(.4953312583) = .2476656292
3. times the GFW of the resulting compound = (.2476656292)(70.9) = 17.55949311 grams
4. Actual/ Theorectical = percentage
5. 7.18 g/17.55949311 g = percentage
6. .4088956301 x 100 =percentage
40.9% is the percentage yield

7. Answer = 92.5 grams
1. grams/GFW or 59.2g/17GFW = 3.482352941
2. times the ratio 4:4 or 1:1 = 1(3.482352941) = 3.482352941
3. times the GFW of the resulting compound = (3.482352941)(30) = 104.4705882 is the Theorectical
4. Actual/ Theorectical = percentage
5. x / 104.4705882 = 88.5/100
6. x = (104.4705882)(.885)
92.45647059 is the actual yield or 92.5 grams

8. Answer = .5 grams
1. grams/GFW or 0.817g/82GFW = .0099634146
2. times the ratio 4:3 or 1:3/4 = 3/4(.0099634146) = .007472561
3. times the GFW of the resulting compound = (.007472561)(3+31+4(16)) = .7323109756 is the theorectical
4. Actual/ Theorectical = percentage
5. x / .7323109756 = 66.4/100
6. x = (.7323109756)(.664)
.4862544878 is the actual yield or .5

9. Answer = 79.4%
a. Actual = 55.5 grams
1. grams/GFW or 30.5g/32GFW = .953125
2. times the ratio 3:2 or 1:2/3 = 2/3(.953125)
3. times the GFW of the resulting compound = (.9531225)(62+48) = 69.89583333 is the theorectical
4. Actual/ theorectical = percentage
5. 55.5g/69.89583333g = .7940387481
6. .7940387481 x 100 = 79.40387481
79.4% is the percentage yield

10. Answer = 113.6 grams
1. grams/GFW or 57.1g/32 = 1.784375
2. times the ratio 1:2 = 2(1.784375) = 3.56875
3. times the GFW of the resulting compound = (3.56875)(70.9) = 253.024375 is the theorectical
4. Actual/ Theorectical = percentage
5. x / 253.024375 = 44.9/100
6. x = (253.024375)(.449) = 113.6079444
113.6 grams is the actual yield
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