An ideal gas (fixed amount) undergoes an isothermal expansion from 10.0 bar to 1.0 bar either (1) re versibly, (2) against a non-zero constant external pressure, or ге- (3) freely against a vacuum. the values of the magnitude of the work obtained from these processes are eill in the question marks with equalities or inequalities (equals, less than, greater than).

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