392. g of aluminum bromide reacts with 73.8 g chlorine producing aluminum chloride and bromine. 1. Write a balanced equation for this reaction
2. Calculate the theoretical yield of bromine.
3. Identify the limiting reactant.
4. Identify the reactant in excess.
5. During the reaction, you were able to collect 285 g bromine. Calculate your percent yield for this reaction.
6. Answer the following multiple-choice question: "How many grams of bromine could theoretically be produced in the reaction?

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