A Chemist Is Given a White Solid That Is Suspected $\Delta$

question 98

Essay

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)? K_f for benzene is 5.12°C/m.
Uncertainties
Mass of solid = ±0.01 g
Mass of benzene = ±0.01 g
$\Delta$ T (freezing point lowering)= ±0.04°C
K_f = ±0.01
Support your answer with calculations.

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Definitions:

Monosomy

Chromosome condition in which a diploid cell has one less chromosome than normal; designated as 2n − 1.

Complete Chromosome

A fully intact and functional chromosome that contains all its genetic information and structures needed for normal cellular activities and division.

Loss

The act or an instance of losing, referring to the fact or process of losing something or someone, typically in a financial, emotional, or physical context.

Locus

Physical location of a trait (or gene) on a chromosome.