An upright cylindrical tank with radius 6 m is being filled with water at a rate of 2 m3/min. how fast is the height of the water increasing? if h is the water's height, the volume of the water is v = πr2h. we must find dv/dt. differentiating both sides of the equation gives

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