A solution containing lead(II) nitrate is mixed with one containing sodium bromide to form a solution that is 0.0130 M in Pb(NO3)2 and 0.0025 M in NaBr. What is the value of Q for the insoluble product

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i think? ?

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

i think tornado but not 100%