Chemistry, 21.11.2019 05:31 brandon1748

2.80g copper chloride and 0.400 g aluminum are mixed together and allowed to react, what is the theoretical yield of copper?

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Answer from: eli719

Answer : The theoretical yield of copper is 1.98 grams.

Solution : Given,

Mass of CuCl_2 = 2.80 g

Mass of = 0.400 g

Molar mass of CuCl_2 = 134.45 g/mole

Molar mass of = 26.9 g/mole

Molar mass of Cu = 63.5 g/mole

First we have to calculate the moles of CuCl_2 and .

$\text{ Moles of }CuCl_2=\frac{\text{ Mass of }CuCl_2}{\text{ Molar mass of }CuCl_2}=\frac{2.80g}{134.45g/mole}=0.0208moles$

$\text{ Moles of }Al=\frac{\text{ Mass of }Al}{\text{ Molar mass of }Al}=\frac{0.400g}{26.9g/mole}=0.0149moles$

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

$3CuCl_2+2Al\rightarrow 3Cu+2AlCl_3$

From the balanced reaction we conclude that

As, 3 mole of CuCl_2 react with 2 mole of

So, 0.0208 moles of CuCl_2 react with $\frac{0.0208}{3}\times 2=0.0139$ moles of

From this we conclude that, is an excess reagent because the given moles are greater than the required moles and CuCl_2 is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of

From the reaction, we conclude that

As, 2 mole of CuCl_2 react to give 3 mole of

So, 0.0208 moles of CuCl_2 react to give $\frac{0.0208}{2}\times 3=0.0312$ moles of

Now we have to calculate the mass of

$\text{ Mass of }Cu=\text{ Moles of }Cu\times \text{ Molar mass of }Cu$

$\text{ Mass of }Cu=(0.0312moles)\times (63.5g/mole)=1.98g$

Therefore, the theoretical yield of copper is 1.98 grams.

Answer from: Quest

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2.80g copper chloride and 0.400 g aluminum are mixed together and allowed to react, what is the theo...

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