Avogadro’s law and Charles’s law describe a proportionality of the volume of a gas when the pressure is constant. Which describes the proportionality that allows these laws to be combined when describing a gas? Volume is directly proportional to temperature (Avogadro’s law) and to moles (Charles’s law). Volume is inversely proportional to temperature (Avogadro’s law) and to moles (Charles’s law). Volume is directly proportional to moles (Avogadro’s law) and to temperature (Charles’s law). Volume is inversely proportional to moles (Avogadro’s law) and to temperature (Charles’s law).

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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