When 50.0 mL of 0.400 mol L-2 Ca(NO3)2 is added to 50.0 mL of 0.800 mol L NaF.
CaF2 precipitates, as shown in the net ionic equation below. The initial temperature of both
solutions is 24.0 °C. Assuming that the reaction goes to completion, and that the resulting solution
has a mass of 100.00 g and a specific heat of 4.18 J gilºc 1, calculate the final temperature of the
solution.
Ca2+(aq) + 2F (ag) - Cafz(s) 4, H = -11.5 kJ

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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