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Questions and Answers
THE PERCENT BY MASS OF AN ELEMENT IN A COMPOUND IS OBTAINED BY USING THE EQUATION:
THE PERCENT BY MASS OF AN ELEMENT IN A COMPOUND IS OBTAINED BY USING THE EQUATION:
$ ext{Percent composition} = rac{ ext{mass of element}}{ ext{molar mass of compound}} imes 100$
The ______ of a compound shows the types of elements present in it and the simplest whole number ratio of the different types of atoms in it. Using the mole, an ______ is the lowest whole-number ratio of moles of atoms of the elements in the compounds.
The ______ of a compound shows the types of elements present in it and the simplest whole number ratio of the different types of atoms in it. Using the mole, an ______ is the lowest whole-number ratio of moles of atoms of the elements in the compounds.
empirical formula
The ______ of a compound shows the actual number of atoms of different elements in one molecule of the compound.
The ______ of a compound shows the actual number of atoms of different elements in one molecule of the compound.
molecular formula
About 200 years ago, it was believed that only living things could produce carbon compounds. However in 1929, a German chemist named Friedrich Wohler produced an organic compound called urea from to inorganic substances.
About 200 years ago, it was believed that only living things could produce carbon compounds. However in 1929, a German chemist named Friedrich Wohler produced an organic compound called urea from to inorganic substances.
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The empirical formula of a compound can be determined from the ______ of a compound. It can also be obtained by conducting an experiment. First, find out the mass of the reactants taking part in the reaction. Next, work out the relative number of moles of the reactants used. Then, you are able to find the formula of the compound.
The empirical formula of a compound can be determined from the ______ of a compound. It can also be obtained by conducting an experiment. First, find out the mass of the reactants taking part in the reaction. Next, work out the relative number of moles of the reactants used. Then, you are able to find the formula of the compound.
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Study Notes
Composition of a Compound
- The percent by mass of an element in a compound is calculated using a specific equation.
Empirical Formula
- The empirical formula of a compound shows the types of elements present and their simplest whole number ratio of atoms.
- It is the lowest whole-number ratio of moles of atoms of the elements in the compounds.
Molecular Formula
- The molecular formula of a compound shows the actual number of atoms of different elements in one molecule of the compound.
History of Organic Compounds
- Around 200 years ago, it was believed that only living things could produce carbon compounds.
- However, in 1829, Friedrich Wohler, a German chemist, produced an organic compound called urea from inorganic substances.
Determining Empirical Formula
- The empirical formula of a compound can be determined from the percent composition of a compound.
- It can also be obtained by conducting an experiment, which involves:
- Finding the mass of the reactants taking part in the reaction.
- Working out the relative number of moles of the reactants used.
- Finding the formula of the compound.
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Description
Test your knowledge of calculating the mass percent of elements in compounds and determining empirical formulas based on percentage composition. Learn to apply the equations for finding the percentage by mass of an element in a compound and deriving empirical formulas from experimental data.
