Show all your work and use the correct number of significant figures and units. 1. A potassium nitrate solution is made by mixing 8.52 g of potassium nitrate with 120.0 mL of water. Use the molar mass of KNO3 given below if necessary. Molar mass of KNO3 = 101.10 g/mol a. Determine the number of moles of potassium nitrate used to make the solution. Show your work. (10 points) b. Determine the mass (in kg) of solvent used to make the solution. Assume that the density of water is 1.000 g Show your work. (10 points)​

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