What dissolves most readily in water? (hint: IMF's) A.
CH4

B.
Na3PO4

C.
gasoline (a non-polar molecule)

D.
All of these will dissolve in water

E.
None of these will dissolve in water

1. they vary with a higher number because boiling is way hotter than melting

2b2t

explanation:

2b2t

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