Q. a boy has a newly minted penny that is composed of zinc and copper in actual composition it contains 2.7 percent of Cu ; determine the density of this newly minted penny if densities of zinc and copper 7.14 and 8.72 g/cm3?
Q. consider the given chemical equation when Aluminum sulfide(Al2S3) reacts with water(H2O) to form aluminum hydroxide(Al(OH)3 and hydrogen sulfide(H2S) as ( Al2S3 (aq) + 6 H2O (l) -----> 2 Al(OH)3 (s) + 3 H2S (g)..Now determine how many grams of aluminum hydroxide will get from 18.2g of aluminum sulfide?