The percent that each element in a compound contributes to the total mass of the compound.
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Empirical formula
Determined by the simplest whole-number ratio of every atom in the compound. It’s a formula showing the proportions of an element present in a compound.
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Molecular formula
The actual formula for the molecule
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Stoichiometry
Scientists perform chemical calculations or stoichiometry to measure the number of reactants and products in a chemical reaction.
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Mole to Mole Stoichiometry
In mole to mole stoichiometry, we start with moles and end with moles.
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Volume to Volume Stoichiometry
Equal volumes of all gases are the same at standard temperature and pressure (STP). You can get the volume ratios from the balanced equation.
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Limiting Reactant
The reactant that is used up first in a chemical reaction
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Excess Reactant
Reactants that are left over when the limiting reactant is gone
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The theoretical yield
The amount of product that would be produced if the limiting reactant completely reacted.
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The actual yield
The amount of product actually produced in the reaction.
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