Balance the equation fe(oh)3 -> fe2o3 + h2o

2 Fe(OH)3 => Fe2O3 + 3 H2O

Explanation: The coefficients are the following: 2,1,3

To balance each atom we write coefficients.

Reactant Product

Fe 2 2

O 6 6

H 6 6

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