Answer;
2000 Hydrogen atoms
Step-by-step explanation;
Each molecule of nitric acid has the formula hno3. if there are 6000 oxygen atoms present and 6000 nitrogen atoms present.
The ratio of H, N and O in nitric acid is; 1 : 1 : 3
Therefore; Hydrogen atoms required are;
= 6000/3
= 2000 Atoms
2000 atoms of hydrogen will be required to convert all oxygen atoms into nitric acid.