Please help!! 1. How many grams of AgNO3 are necessary to make 1.0 L of a 6.0 M stock solution?

2. How would you make 1.0 L of a 0.1 M solution of AgNO3 from your 6.0 M stock solution?

the answer is c.the valence of the atoms combine .

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