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Two.
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).
A molecular formula.
Each molecule of hydrogen sulfide contains two hydrogen atoms and one sulfur atom.
A water molecule is composed of two hydrogen atoms and one oxygen atom.
Two.
The number of atoms of each element present in a molecule is indicated by the subscript to the right of the element symbol in the chemical formula. For example, in H2O, there are 2 hydrogen atoms and 1 oxygen atom.
NaCl has 2 atoms, one of Na (sodium) and one of Cl (chlorine) The chemical formula says that there are 12 molecules of NaCl present so if there are 2 atoms in each molecule of NaCl, there are 24 atoms present.
There are 8 sigma bonds present in CH2Cl2. Each carbon atom is connected to 3 other atoms through single bonds, resulting in 3 sigma bonds for each carbon. The two hydrogen atoms have 1 sigma bond each, and the two chlorine atoms have 1 sigma bond each.
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.
1 Na and 1 Cl
There are a total of 4 silver (Ag) atoms present in each face-centered cubic unit cell.
There are 2 hydrogen atoms present in each water molecule. This can be seen from the formula for water H2O -- this tells us there are 2 atoms of hydrogen combined with 1 atom of oxygen
There are 8 atoms of hydrogen present in NH4 2S. This is because there are 4 hydrogen atoms in each ammonium ion (NH4+) and there are 2 ammonium ions in NH4 2S.
A chemical formula tells you the type and number of atoms present in a compound, the elements that make up the compound, and the ratio of each element in the compound.
There are a total of 6 atoms present in 3MgO. This is because each formula unit of MgO consists of one magnesium atom and one oxygen atom, so for 3MgO, you would have 3 magnesium atoms and 3 oxygen atoms, totaling 6 atoms overall.
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.