Question

count the atoms
how many hydrogen atoms are on both sides of
the chemical equation?
ch₄ + 2o₂ → co₂ + 2h₂o

Explanation:

Step1: Count hydrogen atoms on the left - hand side

In \(CH_4\), the subscript of \(H\) is \(4\). There are no other hydrogen - containing species on the left - hand side. So the number of hydrogen atoms on the left is \(4\).

Step2: Count hydrogen atoms on the right - hand side

In \(2H_2O\), using the formula \(n = 2\times2\) (where the coefficient is \(2\) and the subscript of \(H\) in \(H_2O\) is \(2\)). So \(n = 4\).

Answer:

\(4\)