Into a 1000-gal tank, initially filled with 100 gal of fresh water (density = 62.4 lb/ft), salt water containing 1.92 lb/gal of salt flows at a fixed rate of 4.0 gpm. the density of the incoming solution is 71.807 lb/ft? . the solution, kept uniform by stirring, flows out at a fixed rate of 19.2 lb/min. how many pounds of salt will there be in the tank at the end of 90 minutes? 1 ft = 7.48 gal.

if you're asking what comes out, it's steam.

idk what the question is about

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