Consider the following reaction: 2D + 3F2 --> 2DF3. What is a reasonable guess for the identity of element D? (Your answer doesn't need to be specific to a single element - a particular group or portion of a particular group is fine.)

catya your not at all which answer i've seen you do this on another question!

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

5.6⋅10−^19  j

do you need the explaination?