Be sure to answer all parts. An environmental chemist sampling industrial exhaust gases from a coal-burning plant collects a CO2−SO2−H2O mixture in a 21.0−L steel tank until the pressure reaches 851.0 torr at 43.0°C. (a) How many moles of gas are collected?

explanation:

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