Choose the correct statement
When ethane reacts with fluorine gas the product is less stable,
Addition reactions of unsaturated hydrocarbons and halogens requires a high activation energy.
The double covalent bond within unsaturated hydrocarbons requires a lot of energy to break.
The double covalent bond within unsaturated hydrocarbons can be broken easily.

The double covalent bond within unsaturated hydrocarbons can be broken easily.

Explanation:

They are not connected as strongly, so they are 'pulled apart' easier.

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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