Question

please answer questions 2, 4a, and 4b!!

2 Determine the oxidation numbers designated by letters for the following redox reaction and write them in the blank beside the corresponding letter Cu + 2HNO" Cu(NO3)2 + Hem AE B C D E 3. a. The copper reactions lab was to illustrate the thermodynamic law of reactions _in chemical b. In the copper lab - what was the mathematical formula that you used to attempt to prove that matter remains constant, despite putting it through several chemical reactions? c. Name the type of reaction that occurred when CuO formed CuSO4 4 . If you start with 0.512 g Cu (it is the limiting reagent), predict how many grams of Cu(NO.) will be made in this reaction. b. If the amount of Cu recovered at the end of the experiment was 1.690 grams and not 1.238 g of copper that you started with explain where the error could have occurred. You are expected to be able to use the balance and do proper calculations, so not say it is weighing errors or calculation errors

Answer 1

SOLN 2

Cu(A) + 2HNO3(B) - ---- - -- - > Cu^(C)(NO3)2(D) + H2(E)

oxidation number of any element in its standard state is 0

hence oxidation number of Cu is 0

in HNO3 H is in +1 N is in +5 and let say O is B hence 1+5+3B = 0 hence B = -2

In Cu^(C)(NO3)2 we know NO3 has overall -1 charge s for two NO3^- there will be -2 hence Cu will be +2

and D is oxygen in NO3 which is calculated earlier -2

and H in H2 is 0

therefore

A = 0 ; B = -2 ; C = +2 ; D = -2 ; E = 0

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