There are many minerals which contain silver. A 2.26 g sample of one of these, stephenite, i placed in water and all of its silver ions are released. It takes 5.91 ml of 1.21 M magesium chloride to precipitate all the silver ions just released as the solid silver chloride. Calculates the mass percent of silver in stephanite to the correct umber of sig figs, assume that stephanite contains no chloride ions

the old alchemists made significant contributions to science even though there starting premises were off a bit. their conclusions after failure would steer them into better directions for investigation. science is no more than close observation and the initial mistakes result in rethinking and retrying experiments.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.