Which of the following has the greatest average kinetic energy?
a) 10 grams of ammonia at 55 c°
b) 100 grams of ammonia at 45 c°
c) 10 grams of ammonia at 35 c°
d) 100 grams of ammonia at 25 c°

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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

yes the answer is total mass in unchanged   : )