Someone just cleaned the bathroom at work. you walk into
the bathroom stall and notice a strong chemical smell. you
notify your supervisor and immediately take a look at the
sds. which section will you review to determine the routes
of exposure and symptoms of exposure?
first aid measures
toxicological infomation
stabililty and reactivity
fire-fighting measures

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

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