Which is the false statement about c14? a. it is a stable isotope. b. it is a radioactive isotope. c. it is present in all living things. d. it is used to calculate the age of remains

The false statement is option A.

Explanation:

A rare isotope of carbon is carbon-14. The carbon-14 is radioactive and decays to produce nitrogen-14 and an electron. As carbon-14 is radioactive, it decays at a similar rate possessing a half-life of about 5700 years. The isotope is found in all the living things and is generally used to find the age of remains. The process of finding the age of the remains is known as radiocarbon dating. However, the carbon-14 is not a stable component, and this is the reason why it undergoes radioactive decay.

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