The reaction of quicklime, CaO, with water produces slaked lime, Ca(OH)2, which is widely used in theconstruction industry to make mortar and plaster. The reaction of quicklime and water is highly exothermic:CaO(s) + H2O(l) ⟶ Ca(OH)2(s) ΔH = −350 kJ mol−1(a) What is the enthalpy of reaction per gram of quicklime that reacts?(b) How much heat, in kilojoules, is associated with the production of 1 ton of slaked lime?

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

the correct answer would be b) volume versus temperature, because they are also directly proportional.