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The reaction 2A + 3B --> C is second order with respect to A and first order
with respect to B. When the initial concentrations are [A] = 4.2 x 10-2 M and [B]
= 3.2 x 10-3 M, the rate of the reaction is 9.6 x 10-4 M/s. Calculate the value of
the rate constant for this reaction. You do not need to report the units.

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

gas and precipitate r the correct answers