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How can find molar mass formula |
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Answer» It is very simple.. to find molecular formula you should know the atomic mass of some important elements!!! Such as:- hydrogen, oxygen, nitrogen, sodium, chlorine, sulphur, magnesium and iron. This are some common elements for which you have to remember well it\'s atomic mass. Then you just have to do like this:- Suppose you have calculate the atomic mass of H2O. Then you have to the atomic mass of hydrogen and oxygen, that is H-1 and O- 16 therefore, (1×2+16) = 18. Therefore by this style you can calculate atomic mass of any compound. Step 1. Make use of the chemical formula to determine the number of atoms of each element in the compound.Step 2. Multiply the atomic weight of each element with its number of atoms present in the compound.Step 3. Add up all and assign unit as grams/mole. Example :Identify the molar mass of calcium nitrate,\xa0Ca(NO3)2\xa0?Solution:\xa0Since calcium nitrate contains one atom of calcium, two atoms of nitrogen and six atoms of oxygen.Ca: 1 x 40.1 = 40.1N: 2 x 14.0 = 28O: 6 x 16.0 = 96If we add all, 40.1 + 14 + 16 = 164.1Therefore, the molar mass of Ca(NO3)2 is 164.1 g/mol. |
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