Given the following unbalanced equation: CoCl2 + F2 à CoF2 + Cl2
If you are given 11.84 mole of CoCl2, how many moles of CoF2 will be produced?

11.84 moles

Explanation:

We first balance the chemical equation

Both number of elements in the reactant side is equal to elements on the product side thus this equation is already balanced

Using mole ratio to find moles of

1 mole of CoCl2 reacts with 1 mole of F2 to produce 1 mole of CoF2 and ! mole of Cl2

Mole CoCl2 = Mole CoF2 = 11.84 moles

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