When making pizzas for the Godfather, you use up 14 cans of tomato sauce during the night shift. While working that night shift you make 317 pizzas. Each
can of tomato sauce weights 3 lbs. What weight of tomato sauce is used on one
pizza?

56 moles of   lieter in chemistry

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