Which TYPE of Balancing Chemical Equations problem is shown below? Given the unbalanced equation:
Al2(SO4)3 + Ca(OH)2 + Al(OH)3 + CaSO4
What is the coefficient in front of the CaSo4 , when the equation is completely
balanced with the smallest whole-number coefficients?
Coefficient REPORT Problem or
Coefficient SUM Problem

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

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

i think tornado but not 100%