Question

_h₂o₂ → _h₂o + ___o₂
it is already balanced
2,2,1
2,1,2
2,1,1

Explanation:

Step1: Balance hydrogen atoms

Let the coefficients of \(H_2O_2\), \(H_2O\) and \(O_2\) be \(a\), \(b\) and \(c\) respectively. The chemical equation is \(aH_2O_2
ightarrow bH_2O + cO_2\).
For hydrogen atoms: \(2a = 2b\), so \(a = b\).

Step2: Balance oxygen atoms

For oxygen atoms: \(2a=b + 2c\). Substitute \(a = b\) into \(2a=b + 2c\), we get \(2a=a + 2c\), then \(a=2c\).
Let \(c = 1\), then \(a = 2\) and \(b = 2\).

Answer:

\(2H_2O_2
ightarrow2H_2O + 1O_2\)