Is it kinetic energy or potential energy 1. Energy in the bond between molecules: _
2. Energy of a moving object:_
3. X-ray radiating from an x-ray machine: _
4. Energy inside a bomb:_
5. Energy that is the motion of electrons :_
6. A Skier at the top of the mountain :_
7. Running running refrigerator monitor:_
8. A spring in a pinball machine before it is released:_
9. Gasoline in a storage tank:_
10. Burning a match:_

a patient chooses to not take a beneficial medical treatment.

explanation:

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