Match the following aqueous solutions with the appropriate letter from the column on the right. B 1. 0.12 m AlBr3 A. Highest boiling point D 2. 0.12 m Mn(CH3COO)2 B. Second highest boiling point C 3. 0.13 m BaCl2 C. Third highest boiling point 4. 0.43 m Ethylene glycol(nonelectrolyte) D. Lowest boiling point

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the answer is b. dilution

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