A mixture consisting only of lithium chloride, Lici, lithium carbonate, Li, CO2, and lithium nitrate, LINO, was analyzed. The elemental analysis of the mixture revealed the following: Element % composition Li 14.19 % Cl 10.56 % C 6.198 % 0 59.06% N 10.01 % Calculate the mass percentage of each compound in the mixture.

answer; 4 electrons;

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