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Author Question: A chemist is given a white solid that is suspected of being pure cocaine (molar mass = 303.35 ... (Read 27 times)

KWilfred

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on: Mar 21, 2021
A chemist is given a white solid that is suspected of being pure cocaine (molar mass = 303.35 g/mol). When 1.22 g of the solid is dissolved in 15.60 g of benzene, the freezing point is lowered by 1.32°C. The molar mass is calculated from these data to be 303 g. Assuming the following uncertainties, can the chemist be sure the substance is not codeine (molar mass 299.36)? Kf for benzene is 5.12°C/m.

              Uncertainties

              Mass of solid = ±0.01 g

              Mass of benzene = ±0.01 g

              ΔT (freezing point lowering) = ±0.04°C

              Kf = ±0.01

              Support your answer with calculations.

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Marked as best answer by KWilfred on Mar 21, 2021

Mollythedog

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Reply #1 on: Mar 21, 2021
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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KWilfred

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Reply 2 on: Mar 21, 2021
Great answer, keep it coming :)

diana chang

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Reply 3 on: Yesterday
Wow, this really help

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