In a student experiment, the empirical formula of a copper halide was found by adding aluminum metal to an aqueous solution of the halide, displacing copper metal. The copper metal was filtered, washed with distilled water, dried, and weighed; three separate determinations were performed. The copper halide solution contained 42.62 of copper chloride per liter. The student recorded the following experimental data
Trial A) 49.6 ml of copper chloride solution and weight of copper is .786g
Trial B)48.3 ml of copper chloride in solution and weight of copper is .771g
Trail C)42.2 ml of copper chloride in solution and weight of copper is .669g
What is the empirical formula of copper chloride based on the experimental data?