The chemical formula for water is H2O
If you break that down into its two elements you have H2 and O
therefore you have 2 atoms of Hydrogen bonded to 1 atom of Oxygen in one molecule of Water
You can determine the number of atoms of each element in a compound by using the chemical formula of the compound. The subscripts in the formula indicate the number of atoms of each element. For example, in H2O (water), there are 2 hydrogen atoms and 1 oxygen atom.
The chemical formula shows you this. The subscripted number next to each element shows how many atoms are present in a molecule or formula unit. If no number is shown, then only one atom of that element is present.
There are 4 calcium atoms, 8 chlorine atoms, and 2 carbon atoms in 4CaCl2 (calcium chloride).
There are 9 nitrogen atoms, 3 phosphorus atoms, 12 hydrogen atoms, and 4 oxygen atoms in (NH4)3PO4.
In 4CaCO3, there are a total of 4 calcium (Ca) atoms, 4 carbon (C) atoms, and 12 oxygen (O) atoms.
2
You can determine the number of atoms of each element in a compound by using the chemical formula of the compound. The subscripts in the formula indicate the number of atoms of each element. For example, in H2O (water), there are 2 hydrogen atoms and 1 oxygen atom.
Water molecule (H2O) has 2 hydrogen atoms and 1 oxygen atom.
The chemical formula shows you this. The subscripted number next to each element shows how many atoms are present in a molecule or formula unit. If no number is shown, then only one atom of that element is present.
7
there are 3 in tottal
One molecule of water is formed by combining two hydrogen atoms and one oxygen atom.
Some elements have isotopes - atoms with a different number of neutrons.
There are a total of 25 atoms in Na2S2O3.5H2O. This can be calculated by adding the number of atoms present in each element: 2 sodium atoms, 2 sulfur atoms, 3 oxygen atoms, and 18 hydrogen atoms (5 water molecules with 2 hydrogen atoms each).
1
In each molecule of NO3, there is one nitrogen atom and there are three oxygen atoms.
4 carbon 16 hydrogen