___Consider this reaction. Sn^2+(aq) + 2Fe^3+(aq) rightarrow Sn^4+(aq) + 2Fe^2+(
ID: 527204 • Letter: #
Question
___Consider this reaction. Sn^2+(aq) + 2Fe^3+(aq) rightarrow Sn^4+(aq) + 2Fe^2+(aq) E degree = 0.617 V What is the value of E when [Sn^2+] and [Fe^3+] are equal to 0.50 M and [Sn^4+] and [Fe^2+] are equal to 0.10 M? (A) 0.069 V (B) 0.679 V (C) 0.658 V (D) _____What mass of platinum could be plated on an electrode from the electrolysis of a Pt(NO_3)_2 with a current of 0.500 A for 55.0 s? (A) 27.8 mg (B) 45.5 mg (C) 53.6 mg (D) 9 ______Which combination of reactants will produce the greatest voltage based on these standard electrode potentials? (A) Cu^+ and Sn^2+ (B) Cu^+ and Cr^2+ (C) Cu and Sn^2+ (D) Sn _____Two meals are represented by the symbols L and Z. Which is the best oxidizing agent listed? (A) L (B) L^2+ (C) Z (D)Explanation / Answer
8) Pt2+ + 2e- ==> Pt (s)
I t / 96,485 C/mol = # moles e-
1 ampere of current = 1 coulomb/second
(0.5 C/s)(55x60 s)/96,485 =0.0171 moles of e-
(0.0171 moles of e- ) x (1molPt)/ 2e- =0.00855 moles Pt produced
molar mass Pt= 195.08 g/mol (0.00855 moles Pt)(195.08 g/mol) = 1.7 g
9) Cu+and Cr2+
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