im a freshman in highschool pls help

how many hydrogen and oxygen are in 1 molecule of H2O2 hydrogen peroxide

2) how many atoms of aluminum sulfur and oxygen are in 1 molecule of aluminum sulfate Al2(SO4)3

3) how many atoms of hydrogen and oxygen are in 2 molecules of water

4) how many atoms of hydrogen and oxygen are in 8 molecules of hydrogen peroxide

5) how many atoms of aluminum sulfur and oxygen are in 3 molecules of aluminum spare

6) how would you indicate 2 water molecules using chemical symbols

7) using complete sentences explain the difference between the chemical formulas shown 4 H2O and H8O4