7. Uranium-233 and Uranium-235 are the only two isotopes of uranium used as fuels in nuclear fission reactors. If you had 2.5 kg samples of each, which one would contain the least amount of the original
radioisotope after 1 billion years? Explain your answer. The half life of U-233 is 160,000 years, the
half-life of U-235 is about 700,000,000 years.

yes

explanation:

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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