easy way to find molecular mass
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The molecular mass or molecular weight is the total mass of a compound. It is equal to the sum of the individual atomic masses of each atom in the molecule. It is easy to find the molecular mass of a compound with these steps.
Determine the molecular formulaof the molecule. Use the periodic table to determine the atomic mass of each element in the molecule. Multiply each element's atomic mass by the number of atoms of that element in the molecule. This number is represented by the subscript next to the element symbol in the molecular formula
.Add these values together for each different atom in the molecule.
The total will be the molecular mass of the compound.
i can help you by providing example
For example, to find the molecular mass of NH3, the first step is to look up the atomic masses of nitrogen (N) and hydrogen (H).
H = 1.00794
N = 14.0067
Next, multiple the atomic mass of each atom by the number of atoms in the compound. There is one nitrogen atom (no subscript is given for one atom). There are three hydrogen atoms, as indicated by the subscript.
molecular mass = (1 x 14.0067) + (3 x 1.00794)
molecular mass = 14.0067 + 3.02382
molecular mass = 17.0305
Note the calculator will give an answer of 17.03052, but the reported answer contains fewer significant figures because there are 6 significant digits in the atomic mass values used in the calculation
Determine the molecular formulaof the molecule. Use the periodic table to determine the atomic mass of each element in the molecule. Multiply each element's atomic mass by the number of atoms of that element in the molecule. This number is represented by the subscript next to the element symbol in the molecular formula
.Add these values together for each different atom in the molecule.
The total will be the molecular mass of the compound.
i can help you by providing example
For example, to find the molecular mass of NH3, the first step is to look up the atomic masses of nitrogen (N) and hydrogen (H).
H = 1.00794
N = 14.0067
Next, multiple the atomic mass of each atom by the number of atoms in the compound. There is one nitrogen atom (no subscript is given for one atom). There are three hydrogen atoms, as indicated by the subscript.
molecular mass = (1 x 14.0067) + (3 x 1.00794)
molecular mass = 14.0067 + 3.02382
molecular mass = 17.0305
Note the calculator will give an answer of 17.03052, but the reported answer contains fewer significant figures because there are 6 significant digits in the atomic mass values used in the calculation
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