Equal volumes of two equimolar solutions of reactants A and B are mixed, and the reaction A B S C occurs. At theendof1h, Ais90%reacted. HowmuchofAwillbe left unreacted at the end of 2 h if the reaction is: a. First order in A and zero order in B

catya that's not even a b or c

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