Question

calculate the weight of sodium borohydride needed to reduce 3.4 grams of benzil to hydrobenzoin?

calculate the weight of sodium borohydride needed to reduce 3.4 grams of benzil to hydrobenzoin?

Homework Answers

Answer #1

2CR2CO(aq) + 2H+(aq) + 2e - --> 2CR2COH(aq) (* 2 for since 2 ketones for benzil) * 2

BH4-(aq) + 3H2O(l) --> BO3-3(aq) + 7H+(aq) + 4e-

add

2CR2CO(aq) + NaBH4(aq) + 4H2O(l) --> 2CR2COH(aq) + H3BO3(aq)

so there will be a 2:1 mole equivalence between benzil and the NaBH4

3.4 mg benzil MW = 210.23 g/mole

3.4 mg = 3.4 mg * mole/210.23g * g/1000mg = 2.4 * 10^-4 mole

1/2 mole NaBH4 will be required = 1.2* 10-4 mole

NaBH4 MW = 37.83 g/mole

1.2 * 10^-4 mole NaBH4 = 1.2 * 10^-4 mole * 37.83 g/mole =

= 0.0045 g NaBH4 = 4.5 mg NaBH4

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