Agas obeys the following equation of state: 1) p (v-b) rt+(ap2/t) where p is the pressure, v is the specific volume, t is the temperature, r is the universal gas constant, and a and b are constants for a gas. v (a) [17 points] calculate the entropy change involved when the gas changes from 4 atm and 300 k to 12 atm and 400 k. (b) [8 points] estimate the mean specific heat (cp) at 12 atm. mean specific heat (cp) at 1 atm 8 cal/g value of constant a 1 liter. k/atm. mol value of constant b = 0.08 liter/mol data:

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

d : a person who learns about the world by observing it. no that is not a smiley face

explanation: