It is now time to complete the "Nuclear Energy" discussion. The use of nuclear energy to generate electricity is a highly controversial topic. Nuclear fission
provides an enormous amount of energy with very little input. Normal
operations release only steam and warm water back into the environment and
radioactive waste from spent fuel rods are locked away in surface impoundments.
Do you think we should continue to increase the number of nuclear power plants
in this country to meet our population's every growing needs? Why or why not?

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

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