实验一凝固点降低法测定相对分子质量.docx

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1、五、数据记录和处理1.数据记录纯溶剂第一次纯溶剂第二次溶液第一次溶液第二次时间/s温度/℃时间/s温度/℃时间/s温度/℃时间/s温度/℃09.66608.98609.45709.569158.734158.759158.431159.257308.534308.543308.145308.773458.334458.336457.553458.419608.181608.115607.239608.054758.028757.890757.005757.616907.849907.686906.722907.2201057.7531057.4901056.3221056.892120

2、7.6121207.2971206.1721206.5811357.4221357.1401356.0111356.3081507.3171506.9531505.7541506.0571657.2651656.7791655.6141655.8491807.1811806.6371805.5491805.5901957.0531956.4961955.4601955.5522106.8582106.3832105.4852105.5402256.7192256.3082255.4872255.5312406.6302406.3802405.4882405.5192556.559255

3、6.4092555.4602555.5102706.4762706.4132705.4612705.4952856.4182856.4172855.4582855.4783006.4203006.4143005.4393005.4623156.4273156.4013155.4163155.4453306.4303306.4093305.4023305.4303456.4293456.4083455.3893455.4173606.4323606.4083605.3673605.4033756.4403756.4073755.3533755.3853906.4313906.407390

4、5.3393905.3734056.4384056.4054055.3314055.3574206.4354206.4034205.3174205.3414356.4374356.4014355.2954355.320450　4506.3994505.2804505.301465　4656.3984655.2704655.284480　4806.3964805.2554805.264495　4956.3954955.2494955.237510　5106.3945105.2315105.218525　5256.3935255.2005255.204540　5406.3925405.18

5、15405.189555　5556.3905555.1675555.172570　5706.3865705.1575705.151585　5856.3845855.1305855.131600　6006.3826005.1116005.112615　6156.3806155.0946155.093630　6306.3766305.0846305.075645　6456.3746455.0756455.059660　6606.3716605.0536605.046675　6756.3706755.0336755.026690　6906.3666905.0106905.000705　705

6、6.3637054.9917054.9791.步冷曲线绘制2.根据步冷曲线，确定溶剂和溶液的凝固点环己烷的体积：30ml环己烷的密度：0.774g/ml环己烷的质量：23.22g萘片的质量：0.1140g环己烷凝固点平均值T*f=6.409℃萘的环己烷溶液凝固点平均值Tf=5.460℃3.计算萘的相对摩尔质量MB=（Kf×WB）/（ΔT×WA）=（20.2×0.1140）/（0.949×23.22）g·mol-1=0.11g·mol-1