Short Answer - Write your answer in the space below each question. 10. Could you expect the properties of calcium carbonate (Cacos) to be similar to the
properties of the elements calcium (Ca), carbon (C) and oxygen (O)? Why or why not?

answer: mole of the gas

answer: mole of the gasexplanation:

the answer is a for sure mark brainliest i had got this right on usatestprep

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