Use the chemical reaction to answer the question. 2H2+O2→2H2O There are four atoms of hydrogen ( H ) before the reaction. How many atoms of hydrogen are present after the reaction? (1 point) Responses 5 5 2 2 4 4 8

1 answer

In the chemical reaction \(2H_2 + O_2 \rightarrow 2H_2O\), there are 4 atoms of hydrogen (since \(2H_2\) means 2 molecules of hydrogen, and each molecule contains 2 hydrogen atoms).

After the reaction, the product is \(2H_2O\), which contains 2 molecules of water. Each water molecule (H₂O) contains 2 hydrogen atoms, so \(2H_2O\) contains a total of \(2 \times 2 = 4\) hydrogen atoms.

Therefore, the number of hydrogen atoms present after the reaction is 4.