Copper(II) hydrogen arsenite (CuHAsO3) is a green pigment once used in wallpaper. In damp conditions, mold metabolizes this compound to trimethylarsine [(CH3)3As], a highly toxic gas. (a) Calculate the mass percent of As in each compound. (b) How much CuHAsO3 must react to reach a toxic level in a room that measures 12.35 m  7.52 m  2.98 m (arsenic is toxic at 0.50 mg/m3)?