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

Answer : The theoretical yield of copper is 1.98 grams.

Solution : Given,

Mass of = 2.80 g

Mass of = 0.400 g

Molar mass of  = 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 and .

Now we have to calculate the limiting and excess reagent.

The balanced chemical reaction is,

From the balanced reaction we conclude that

As, 3 mole of react with 2 mole of

So, 0.0208 moles of react with moles of

From this we conclude that, is an excess reagent because the given moles are greater than the required moles and 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 react to give 3 mole of

So, 0.0208 moles of react to give moles of

Now we have to calculate the mass of

Therefore, the theoretical yield of copper is 1.98 grams.

a patient chooses to not take a beneficial medical treatment.

explanation:

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol