use the chemical reaction to answer the question.
2H2 + O2 -- 2H2O
There are four atoms of hydrogen before the reaction how many atoms hydrogen are present after the reaction?
1. 2
2. 5
3. 4
5. 8
The correct answer is 4. After the reaction, two molecules of water (H2O) are formed, each containing two atoms of hydrogen. Therefore, there are a total of 4 hydrogen atoms present after the reaction.
instead of 5. 8 i meant 4. 8 sorry!!
No problem! If you meant to select 4. 8 as the answer, then that would be incorrect. The correct answer is 4, as explained in the previous response. There are four atoms of hydrogen before the reaction, and after the reaction, they combine with oxygen to form two molecules of water, which contain a total of four hydrogen atoms.
According to the chemical reaction 2H2 + O2 -- 2H2O, we can see that for every 2 molecules of H2, 2 molecules of H2O are produced. Since each molecule of H2 contains 2 atoms of hydrogen, the number of hydrogen atoms present after the reaction can be calculated as follows:
2 molecules of H2 x 2 atoms of H = 4 atoms of hydrogen.
Therefore, the correct answer is 4.
To determine the number of hydrogen atoms present after the reaction, we need to look at the balanced chemical equation provided: 2H2 + O2 → 2H2O.
In this reaction, we can see that for every 2 molecules of H2 (hydrogen gas) participating in the reaction, we get 2 molecules of H2O (water). Since each H2O molecule contains 2 hydrogen atoms, we can conclude that for every 2 molecules of H2, we have 4 hydrogen atoms in the product, 2H2O.
So, the correct answer would be option 3: 4.