There are two different compounds of sulfur and fluorine.
in sf6, the mass of fluorine per gram of sulfur is 3.55 g f/g s.
in the other compound, sfx, the mass of fluorine per gram of sulfur is 1.18 g f/g s.
what is the value of x for the second compound?
express your answer as an integer.

i think it's letter a.

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