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
To determine how many atoms are in each element of a compound, you can analyze its chemical formula. The formula indicates the number of atoms of each element present; for example, in water (H₂O), there are two hydrogen (H) atoms and one oxygen (O) atom. If the formula includes subscripts, they represent the number of atoms for the corresponding element, while parentheses may indicate groups of atoms that are counted together. For elements in their pure form, like O₂, the subscript directly tells you the number of atoms, in this case, two oxygen atoms.
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.