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.

Question

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.

Quizplus · Accepted Answer

The Answer of 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.

A Chemist Is Given a White Solid That Is Suspected Δ\DeltaΔ

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