How To Calculate Molecular Weight

In the case of aspirin the molecular weights of carbon hydrogen and oxygen are 1201 101 and 1600 amu respectively.

How to calculate molecular weight. This online calculator you can use for computing the average molecular weight mw of molecules by entering the chemical formulas for example c3h4ohcooh3. First list each element present in the molecule. Calculate the total mass for each element. We then take the atomic weight of the atoms from the periodic table.

Calculating molecular weight 1. Then you need to discover from the period table of elements the molar masses for those elements. Enter the chemical compound in the respective input field step 2. Use a copy of the periodic table of elements.

The molecular weight is the sum of the atomic weights of the atoms in the molecule. Multiply each elements atomic massby the number of atoms of that element in the molecule. Now click the button calculate molecular weight to get the weight step 3. Multiply the number of each type of atom by its molecular weight and then sum the products.

Water contains hydrogen and oxygen. We can go about our calculation by making a table. In order to calculate the molecular weight of a substance you need to assess the elements and the numbers of atoms from which that substance is composed. Then we write down how many of each of these atoms the molecule contains which in the case of water is 2 and 1.

Determine the molecular formulaof the molecule. Use the periodic table to determine the atomic massof each element in the molecule. Count how many atoms of each element exist in the molecule. Or you can choose by one of the next two option lists which contains a series of common organic compounds including their chemical formula and all the elements.

Find the relative atomic mass of each element in the molecule. We list the atoms in the molecule down the left.