Question

formation of water reaction
element
oxygen
hydrogen
number of atoms before
reaction

1. enter text.
2. enter text.

number of atoms after
reaction

1. enter text.
2. enter text.

2 h₂ + o₂ → 2 h₂o

Explanation:

Step1: Count oxygen atoms before reaction

In \(O_2\), there are \(2\) oxygen atoms.

Step2: Count oxygen atoms after reaction

In \(2H_2O\), each \(H_2O\) has \(1\) oxygen atom, so \(2\times1 = 2\) oxygen atoms.

Step3: Count hydrogen atoms before reaction

In \(2H_2\), each \(H_2\) has \(2\) hydrogen atoms, so \(2\times2=4\) hydrogen atoms.

Step4: Count hydrogen atoms after reaction

In \(2H_2O\), each \(H_2O\) has \(2\) hydrogen atoms, so \(2\times2 = 4\) hydrogen atoms.

Answer:

1. \(2\)
2. \(2\)
3. \(4\)
4. \(4\)