Hi i really need help with this pre lab assignment. i will post this question fo

Question

Hi i really need help with this pre lab assignment.

i will post this question for 3000 pts and if my website accepts you answers and i understand your methodology. ill repost this question for another 3000 pts. i really need help!

https://www.dropbox.com/s/zik2cb0d3wd4h7z/ProblemCuAg.pdf

so far i found

a) Mass of Silver Metal produced = 45.1 mg

d) Mass of Copper Metal lost from wire = 15.6 mg

f) Absorbance of Cu^+2 Standard = 0.268

g) Absorbance of Cu^+2 in reaction tube = 0.235

h) Molarity of Cu^+2 in reaction tube (in 6ml) = 0.03173 M

i) Millimole of Cu^+2 in reaction tube (in 6ml) = 0.1904 mmol

i really need help solving B,C (can be solved from A and B ),E (from A and D ),J( from A, F-I)

the density of silver is 10.05 mg/cc

thanks for your help in advance i will not rate any copied and pasted wiki postes

Explanation / Answer

b) milli moles of AgNO3 used = 3.3 x0.1335 = 0.4405

milli moles of Ag+ used = 0.4405 is ans for b

c) Molar mass = mass of Ag in mg/milli moles

= 45.1/0.4405 = 102.37 gm/mol

e) milli moles of Cu2+ lost = 15.6/63.546 = 0.2455

milli moles of Ag+ lost as per stochiometry = 2x0.2455 = 0.49

molar mass of Ag = 45.1/0.49 = 92.04 gm/mol

j) milli moles of Cu2+ produced = 0.1904

milli moles of Ag+ used = 2 x0.1904 = 0.3808

molar mass of Ag = 45.1/0.3808 = 118.435 gm/mol

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