9. if you use 10 g of benzil to react with enough amount of acetic nabh4, how much product (benzoin) will you obtain if the reaction yield is 85%?

Answer : The mass of benzoin is, 8.58 grams.

Explanation :

First we have to calculate the moles of benzil.

Molar mass of benzil = 210.23 g/mol

Now we have to calculate the moles of benzoin.

The balanced chemical reaction is:

From the balanced chemical reaction we conclude that,

As, 1 mole of benzil react to give 1 mole of benzoin

So, 0.0476 mole of benzil react to give 0.0476 mole of benzoin

Now we have to calculate the mass of benzoin.

Molar mass of benzoin  = 212.24 g/mol

Theoretical yield of benzoin = 10.1 g

Now we have to calculate the experimental mass of benzoin.

Therefore, the mass of benzoin is, 8.58 grams.

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