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63.15% C x 1/12.01 =5.258 5.258/1.972 = 2.666 x 3
5.30% H x 1/1.01 =5.248 5.248/1.972 = 2.661 x3
31.55% O x 1/16.00 =1.972 1.972/1.972 = 1
= C3OH3
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It's empirical formula would be NH2. An empirical formula represents the ratio of the atoms in the compound, rather than the actual number. You can work this out by dividing by a common denominator (in this case, 2).
Why are molecular formula of a compound such more useful to a forensic scientist than the empirical formula?
It contains the true chemical formula in the molecule so it's technically more precise to work with.
How can you find the molecular formula of a compound when its percentage composition is given?
Yes, if you have some additional information, such as the molecular weight. For instance, the molecules C2H4 and C4H8 have exactly the same percent composition, but they are very different molecules. So you need some other information to tell them apart than the percent composition.Answer ExpandedThis is kind of a trick question. By knowing the percent composition, you would easily be able to determine its empirical formula, but molecular formula is a bit different. The molecular formula is the actual number of atoms in a molecule, so in order to find the specific molecular formula of a substance, you would also need to know how many grams there is of that substance.(This explains the difference between C2H4 and C4H8)
A compound has a mass of 16.7g 12.7g Iodine 4g Oxygen Therefore the empirical formula is I2O5 What additional information do you need to work out the molecular formula?
You need to know the Relative Molecular Mass of the compound, then you find the ratio of that compared to the R.M.M. of I2O5 and then multiply the ratio by I2O5. That should be it.
When 97.5grams of zinc was heated in oxygen 121.5grams of zinc oxide was formed calculate the empirical formula of the oxide?
This is how to work it out:Elements that combine:Zinc+OxygenMasses that combine:97.50 g121.50 gRelative atomic mass (Ar):65.40g16 gMoles of atoms that combine:97.50/65.40 = 1.49...`121.50/16 = 7.59375Ratio in which atoms combine:1.49... : 7.59375 OR 1 : 5 (simplified)Empirical formula (the simples ratio in which atoms in a compound are combined) should be ZnO5This is the method that should be used to work it out, although just check for yourself that the answer is right as usually the actual formula for zinc oxide is ZnO - so just check that it's right
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