Jeffery has 1.0 gram of baking soda and a 5.0 sample gram of vinegar. He combines the two samples in a sealed plastic bag. the baking soda and vinegar react releasing bubbles and heat. after the reaction is complete Jeffery measures the mass of the bags content. the bags content should measure what

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