ANYONE HELPP ! NEED HELP ASAP ILL GIVE BRAINLEST P&T (Does the wind turn? A. No, the wind blows straight from the poles to
the equator.
B. No, the wind blows straight from the equator
to the poles.
C. Yes, the wind turns moving from the poles to
the equator.
D. Yes, the wind turns moving from the equator
to the poles.)

a:

by the combination of an unlimited number of elements

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