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QUESTION

# Iron reacts with chlorine gas, Cl_2, to form iron(III) Chloride, FeCl_3. How do you write the balanced equation for this synthesis reactions?

Simply write the equation and then check if number of atoms of an element present in RHS = LHS.

The equation for this synthesis reaction is :

 Fe + Cl_2 = FeCl_3

Now as we can observe, Fe is balanced, but Cl is not.

1. Balancing Cl :

2. Since we want the least number to be multiplied on both sides to balance the equation, we take LCM of 2 and 3 which is 6

3. Multiply RHS Cl by 3 and LHS Cl by 2

The reulting equation becomes:

 Fe + 3Cl_2 = 2FeCl_3

1. Balancing Fe :

2. Now, the LHS has 1 Fe and the RHS has 2 Fe atoms.

3. Multiply RHS Fe by 2

The final balanced equation is as follows:

2Fe + 3Cl_2 = 2FeCl_3

Hope this helps :)

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