Answer to Question #250109 in General Chemistry for jojo

Question

The first question) Calculate the percentage atom economy of using copper oxide and sulfuric acid to make copper sulfate:

CuO(s) + H₂SO₄(aq) --> CuSO₄(aq) + H₂O(l)

Give your answer to 3 significant figures

second question) Calculate the atom economy to make copper nitrate:

CuCO₃(s) + 2HNO₃(aq) --> Cu(NO₃)₂(aq) + CO₂(g) + H₂O(l)

Give your answer to 3 significant figures

Answer 1

$\%\; atom\; economy=\; mass\; of\; the\; desired\; product$ Question 1

 % atom economy= mass of the desired reactant/Total mass of all the reactant  

                                  

Mass of desired reactant (copper oxide) =76

Total mass of all the reactant (copper oxide and sulphuric acid) =76+98=174

 

% atom economy (copper oxide) =   76/174* 100= 43.7%

                                                   

% atom economy (sulfuric acid) = mass of desired reactant/Total mass of the reactant

Mass of desired reactant(sulphuric acid) =98

Total mass of all the reactant (copper oxide and sulphuric acid) =76+98=174

                                                       

% atom economy (sulfuric acid) =  98/174*100 = 56%

                                                        Question 2

% atom economy (copper nitrate) = mass of the desired product/ Total mass of the all reactants

                                                      

Mass of Cu(NO₃)2= 187.6

Mass of CuCO₃ = 123.6

Mass of HNO₃ = 2(63.0) = 126

% atom economy (copper nitrate) =  187.6/(123.6+126_­) *100 = 74.9%