The equation of the line is y = -0.0006x + 195.68 (a) how long in minutes will it take for a 15.0 g of water to evaporate? i divided 15g by 0.0006g i got 25000 minutes. (b) what is the rate of evaporation in kilograms per hour? i got 0.36kg/hr are my answers correct?

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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