there are four.
2 Al and 3 O
Five, one sulfur and four oxygen with a charge of -2
1 formula unit of aluminum sulfate has the formula Al2(SO4)3. So there are 2 atoms of aluminum, 3 atoms of sulfur and 12 atoms of oxygen in 1 formula unit of aluminum sulfate. There are no molecules of aluminum sulfate. They are called formula units.
There are 13 protons in aluminum and 13 electrons. So, there are 13 atoms in aluminum. In oxygen, there are 8 protons and 8 electrons. thus there are 8 atoms. EDIT: This answer is absolutely and completely incorrect. (Dr.J.)
Aluminum oxide has a chemical formula of Al2O3, which means there are 2 aluminum atoms and 3 oxygen atoms in each molecule of aluminum oxide.
The formula for aluminum nitrate is Al(NO3)3, so there are 9 oxygen atoms. Multiply the number of oxygen atoms inside the parentheses times the subscript outside the parentheses.
The reactant aluminum phosphate has a chemical formula AlPO4. There are 4 oxygen atoms in one molecule of aluminum phosphate.
In aluminum chromate, the chemical formula is Al2(CrO4)3. This means that there are a total of 12 oxygen atoms in aluminum chromate (4 oxygen atoms in chromiumate ion multiplied by 3 chromiumate ions).
There are three oxygen atoms present in a formula unit of Aluminum Hydroxide (Al(OH)3).
There are 12 oxygen atoms in a molecule of aluminum sulfate. The formula for aluminum sulfate is Al2(SO4)3. This tells us there are 3 sulfate ions, each with 4 oxygen atoms per sulfate, so 3 * 4 = 12.== ==
One Sulphate molecule contains 5 atoms, one of sulphur and 4 of oxygen.
Al(OH)3 One atom of aluminum. Three atoms of oxygen. Three atoms of hydrogen.