Question

Balance the equations by inserting coefficients as needed. CaH₂ + H₂O Ca(OH)₂ + H₂

Answer 1

The balanced equation is $CaH_{2} + 2 H_{2} O = Ca(OH)_{2} + 2 H_{2}$.

The above equation is a redox reaction. A chemical equation is said to be balanced when the total mass of atoms on the reactant and product side are equal. This means that the number of atoms on both side must also be equal.

We have, $CaH_{2} + H_{2} O = Ca(OH)_{2} + H_{2}$.

The number of atoms of Calcium (one on both sides) and Hydrogen(four on both sides) are equal. Whereas, there are 2 atoms of Oxygen on the right-hand side and only  1 atom of Oxygen on the left-hand side. So, we can put the coefficient of 2 on the molecule that has Oxygen on the left-hand side to balance them out. i.e.,

$CaH_{2} + 2H_{2} O = Ca(OH)_{2} + H_{2}$

Now, there are 6 atoms of Hydrogen on the left-hand side but only 4 on the right-hand side. To balance this, we can put the coefficient of 2 on the Hydrogen molecule on the right-hand side.

Thus, we get the final balanced equation as :$CaH_{2} + 2 H_{2} O = Ca(OH)_{2} + 2 H_{2}$

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