Propane (C3H8) is used in domestic cooking and heating A typical home in Massachusetts burns 850 gal of propane for heating over the course of a year. How many moles of propane are burned ( the density of propane is approximately 4.2lb/gal)

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po-215 i got it right on the quiz

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