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Not completely. The empirical formula of a substance can be determined from its percent composition, but a determination of molecular weight is needed to decide which multiple of the empirical formula represents the molecular formula.

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โˆ™ 2012-02-23 14:24:43
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Q: Can you determine the molecular formula of a substance from its percent composition?
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It is possible to determine the molecular formula of a substance from its percentage composition?

From the percentage composition only, an empirical formula can be derived, but a proper molecular formula can only be assured by adding some information about the molecular weight of the substance concerned.


What does compounds molecular formula tells what?

Molecular formula of a chemical substance is representative for the composition of this chemical substance.


Can you determine the molecular formula of a substance from its percentage composition?

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)


Why is sugar a pure substance?

Sugar is a pure substance because it has a definite composition. Its molecular formula is C12H22O11.


Explain why the percent composition of certain compounds are not sufficient to determine the compounds molecular formulas?

Because unlike the empirical formula, the molecular formula does not have to be the simplest ratio.If by chance you are given the percent composition of the elements in a substance, you could calculate the empirical formula and then the empirical formula's mass. However, the molecular formula equation is molecular formula= (empirical formula)n, where n is the mass of the molecular formula divided by the mass of the empirical formula. You would, therefore, need to know the mass belonging to the molecular formula, which you are not given.


To determine the formula of a new substance one of the first steps is to find?

Percent composition


To determine the formula of a new substance one of the first steps is to find the?

Percent composition.


What tells you the number and types of atoms within a substance?

You can determine the chemical formula of this substance and consequently the elemental composition.


What does a compound formula tell you?

A compound formula, or molecular formula, tells you about the chemical composition of the substance in terms of the number of atoms of that element that are present. From there, the empirical formula may also be derived by simplifying the molecular formula, as well as its structural formula.


Which substance shows a substance that is not molecular?

A formula unit.


Which formula show a substance that is not molecular?

A formula unit.


Which formula shows a substance that is not molecular?

A formula unit.

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