A reaction was found to be zero order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to . A reaction was found to be zero order in A. Increasing the concentration of A by a factor of 3 will cause the reaction rate to . triple decrease by a factor of the cube root of 3 remain constant increase by a factor of 9 increase by a factor of 27

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

a chemical change results in a new substance being formed; whereas a physical change will result in a different state of matter

explanation: