Question

When the equation Fe+Cl2→FeCl3 is balanced, what is the coefficient for Cl2?​

Answer 1

The coefficient of chlorine is 3.

• Iron reacts with chlorine gas to form ferric chloride.
• The reaction is-
• $2Fe+3Cl_2\rightarrow 2FeCl_3$
• Thus two moles of Iron reacts with three moles of chlorine gas to form two moles of ferric chloride salt.
• Thus the coefficient of chlorine is 3.

Answer 2

Answer:

Concept:

An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction. In other words, both sides of the reaction have equal amounts of mass and charge.

Explanation:

Given:

A chemical equation , $Fe+Cl_{2}$ → $FeCl_{3}$

To do :

Balancing  of the equation

Solution:

The number of atoms of $Fe$ is $1$ on both sides. But the number of atoms of $Cl$ is $2$ and $3$ on left and right side respectively. So, in order to match the atoms of $Cl$ , we can add $2$ as coefficient on product side so that the equation becomes

                                                 $Fe+Cl_{2}$→ $2 FeCl_{3}$

Now the number of atoms of $Cl$ becomes $6$ on product side. To compensate it on reactants side, $3$ is added before the component $Cl$  as  below:

                                                $Fe+3Cl_{2}$ → $2FeCl_{3}$

At step 2, the number of atoms of $Cl$ gets matched on both sides, but the atoms of $Fe$  still need to be balanced. The number of $Fe$ atoms on product side is $2$ and so coefficient $2$ is added to reactant side for the component $Fe$  as below:

                                              $2Fe +3Cl_{2}$ → $2FeCl_{3}$

The equation is balanced with $2$  $Fe$ and $6$ $Cl$ atoms on both reactants and product side.

From this balanced equation    $2Fe +3Cl_{2}$ → $2FeCl_{3}$  , the coefficient of $Cl_{2}$  is $3$.

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