Question

When the following redox equation is balanced with smallest whole–number coefficients, the coefficient for ReO41- will...

When the following redox equation is balanced with smallest whole–number coefficients, the coefficient for ReO41- will be _____.

Au(s) +   ReO4–(aq) --> Re(s) + Au3+(aq) (acidic solution)

A.

2   
B.

3   
C.

7  
D.

8  
E.

None of these choices is correct.
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Homework Answers

Answer #1

Au(s) +   ReO4–(aq) --> Re(s) + Au3+(aq) (acidic solution)

first half

Au ..............>Au^+3

Au ..............>Au^+3 +3e- ...................1

second half

ReO4^- .............................> Re

ReO4^- .............................> Re + 4H2O

ReO4^- + 8H+ + 7e-.............................> Re + 4H2O ...............2

do eq.1*7 + eq.*3

3ReO4^- + 24H+ + 7Au............................> 3Re + 12 H2O + 7Au^+3

so option B is correct

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