A forensic chemist is given a white solid that is suspected of being pure cocaine . She dissolves 1.22 ± 0.01 g of solid in 15.60 ± 0.01g benzene. The freezing point is lowered by 1.32 ± 0.04°C. What is the molar mass of the substance? Assuming that the percent uncertainty in the calculated molar mass is the same as the percent uncertainty in the temperature change, what is the uncertainty in the molar mass?
