12.7 Let Wbe the weight percent of maltose in an aqueous so- lution. The following freezing-point depressions are observed for maltose (aq) solutions: W 3.00 6.00 9.00 12.00 AT,/°C -0.169 -0.352 -0.550 -0.765 (a) Show that the equation AT₁ = -km gives M₁ = -k+WB/ (ATW), where w₁ and WA are the masses of B and A in the solution. (b) Plot the calculated molecular weights vs. W and extrapolate to zero concentration to find the true molecular weight.
12.7 Let Wbe the weight percent of maltose in an aqueous so- lution. The following freezing-point depressions are observed for maltose (aq) solutions: W 3.00 6.00 9.00 12.00 AT,/°C -0.169 -0.352 -0.550 -0.765 (a) Show that the equation AT₁ = -km gives M₁ = -k+WB/ (ATW), where w₁ and WA are the masses of B and A in the solution. (b) Plot the calculated molecular weights vs. W and extrapolate to zero concentration to find the true molecular weight.
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Transcribed Image Text:12.7 Let Wbe the weight percent of maltose in an aqueous so-
lution. The following freezing-point depressions are observed
for maltose (aq) solutions:
W
3.00
6.00
9.00
12.00
AT,/°C
-0.169
-0.352
-0.550
-0.765
(a) Show that the equation AT₁ = -km gives M₁ = -k+WB/
(ATW), where w₁ and WA are the masses of B and A in the
solution. (b) Plot the calculated molecular weights vs. W and
extrapolate to zero concentration to find the true molecular
weight.
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