How To Find The Molecular Formula Of A Compound With Molar Mass
If the formula used in calculating molar mass is the molecular formula the formula. If the formula used in calculating molar mass is the molecular formula the formula weight computed is the molecular weight.
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It is found to contain 4000 carbon 672 hydrogen and 5328 oxygen.
How to find the molecular formula of a compound with molar mass. This answer gives you the number youll need to multiply the subscripts in the empirical formula to get the molecular formula. Then divide the molecular formula weight by the empirical formula weight. The formula weight is simply the weight in atomic mass units of all the atoms in a given formula.
If you are given percent composition you can directly convert the percentage of each element to grams. You can double check that you got the right answer by calculating the molecular molar mass of the molecular formula you calculated. You start by determining the empirical formula for the compound.
Using the chemical formula of the compound and the periodic table of elements we can add up the atomic weights and calculate molecular weight of the substance. For example a molecule has a molecular weight of 18018 gmol. Determine the mass in grams of each element in the sample.
The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom or group of atoms in the formula by the formula weight and multiplying by 100. Finding the molar mass of a single element is really simple. All you need to do is find the atomic mass of the element on the periodic table and report the number with the unit grams per mole or gmol.
From this you can see that sodiums molar mass will be 2299 gmol.
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