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Answer : The percent yield of  is, 24.44 %

Explanation :

First we have to calculate the moles of 3.81 g and 2.86 g of .

Moles of  reacted = 0.045 - 0.034 = 0.011 g

Now we have to calculate the moles of

The balanced chemical reaction will be,

From the balanced reaction, we conclude that

As, 2 moles of react to give 1 mole of

So, 0.011 moles of react to give mole of

Now we have to calculate the mass of

The actual yield of  = 0.341 g

If whole of  have reacted then  produced.

From the balanced reaction, we conclude that

As, 2 moles of react to give 1 mole of

So, 1 mole of react to give 0.5 mole of

And, 0.045 mole of react to give mole of

The mass of  produced.

The theoretical yield of  = 1.395 g

Now we have to calculate the percent yield of

Therefore, the percent yield of  is, 24.44 %