Question

Use the chemical reaction to answer the question we have 2H small 2+0 small too and then we had 2H small 20 therefore atoms of hydrogen before the reaction how many atoms of hydrogen are present after the reaction is it eight or five or four or two?

Answer 1

In the chemical reaction you provided, 2H₂ + O₂ → 2H₂O, we can count the hydrogen atoms before and after the reaction.

Before the reaction:
- There are 2 molecules of H₂ (each molecule has 2 hydrogen atoms), so:
\( 2 \text{ H₂} = 2 \times 2 = 4 \text{ hydrogen atoms} \)

After the reaction:
- In 2 molecules of water (H₂O), each molecule contains 2 hydrogen atoms, so:
\( 2 \text{ H₂O} = 2 \times 2 = 4 \text{ hydrogen atoms} \)

Therefore, the number of hydrogen atoms before the reaction is the same as after the reaction, which is 4 atoms.

So, the answer is **four**.