Question

# Balance the equation and calculate the number of mmol and mg of potassium dichromate required for...

Balance the equation and calculate the number of mmol and mg of potassium dichromate required for the oxidation of 1.7 mmol of indene. Do not forget to include hydronium ion as a reactant and water as a product. How much potassium dicrhormate (mg and mmol) corresponds to a 10 mol % excess?

#### Homework Answers

Answer #1

Half reactions are:

Multiply dichromate half reaction by 4 and Indene half reaction by 3. Then add

With the balanced equation we can make the calculations for the problem. 3 mmol of indene needs 4 mmol of potassium dichromate so 1.7 mmol would need:

mmol K2Cr2O7 = 1.7 mmol x 4/3 = 2.27 mmol (10% is 0.227 mmol)

MW of K2Cr2O7 is = 294.2 mg/mmol

mg of K2Cr2O7 = 2.27 mmol x 294.2 mg/mmol = 666.8 mg (10% is 66.68 mg)

Add 10% excess: mmol K2Cr2O7 =2.5 mmol and mg of K2Cr2O7 = 733.5 mg

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