Which conditions can result in deviations from beer's law when the pathlength is constant?
a. all radiation not absorbed by the sample is transmitted to the detector
b. solute concentrations exceeding 0.01 m
c. the sample is homogeneous
d. the use of polychromatic radiation
e. the absorbing species undergoes dissociation or association

passing a magnet thought the

mixture , because iron gets attracted to magnet .

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