Question 14 of 25 2 Points
Which of the following is a cost of mining aluminum from new bauxite
deposits?
A. It helps preserve plants and animals in rain forests.
O O O
B. It requires a large amount of energy.
C. It takes less energy to transport this lightweight metal
D. It can be recycled over and over again.

1.solid

2.carbon dioxide

3.helium

your answer would be “dry”

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

0.88m hope i am correct : )