Question

ch₄(g) + 2o₂(g) → co₂(g) + 2h₂o(l)
in this reaction, the oxygen atom in carbon dioxide has a subscript of
2
4
1
g

Explanation:

In the chemical formula \(CO_2\), the subscript indicates the number of atoms of an element. Here, for oxygen (\(O\)), the subscript is \(2\). The other options: \(4\) is incorrect as there are no \(4\) oxygen atoms in \(CO_2\); \(1\) would be for a single atom (like in \(CO\) if it was \(CO\) but here it's \(CO_2\)); \(g\) is a state symbol (gas) not a subscript for the number of atoms.

Answer:

2