Distillation. Any filtration or distillation is a process that could be used to separate dissolved particles from the liquid in a solution.
Use stoichiometry to solve this problem. We know that 1.00 mole of CuO is (about) 45g, and we also know that the ratio of CuO to Cu is 1:1, meaning that 1 mole of CuO can be used to produce 1 mole of Cu. Look up the molar mass of Cu on the periodic table to see the answer.
An endothermic reaction is that which takes in heat or energy in order for the reaction to proceed. In the chemical equation, heat appears in the reactant side. From the given choices, there is only one in which heat is in the reactant side. Thus, the answer is letter D.
The molar mass of CuCl2 is 134.45 g/mol; therefore, you divide 2.5 g of CuCl2 by 134.45 g of CuCl2 leaving you with 0.019 moles.
I hope this works.
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