20 kg of LiCl(s) is added to 125 kg of an aqueous solution containing 10 wt% LiCl at 25 °C? If the mixing process is isothermal, how much heat must be removed from the system? The molecular weights are 42.39 g/mol for LiCl and 18.015 g/mol for water. The heat of solution for 1 mole of LiCl in 8.145 moles water is about -32 kJ/mole LiCl(s). The heat of solution for 1 mole of LiCl in 21.177 moles water is about -35 kJ/mole LiCl(s).

The molecular formula for caffeine is cshion402. which of the following elements is not found in caffeine?

Which of the following is an indication that a substance has undergone a chemical change? a. no new product has been formed. b. the color of the substance has not changed. c. the original constitute has not changed. d. the molecular structure has changed.

One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .