# When the following equation is balanced, what is the coefficient for Mg? #Mg(s) + HCl(aq) -> MgCl_2(aq) + H_2(g)#

##### 1 Answer

May 22, 2017

1 is the coefficient. See below.

#### Explanation:

So, to balance a chemical equation we make the number of each element the same on both sides.

We have:

LHS

Mg= 1

H= 1

Cl= 1

RHS

Mg= 1

Cl=2

H=2

To make Cl and H have 2 on both sides, we place a 2 in front of the HCl

LHS

Mg=1, H=2, Cl=2

RHS

Mg=1, H=1, Cl=2

Thus the equation is balanced and the coefficient of Mg is 1, which is understood so it is not written in the final equation.