Ch 27
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What is a compound?
A pure substance made of two or more elements in a fixed proportion
Noble gases are the only elements that can’t
React with other elements to form compounds
What is a combination of two or more atoms held together by covalent bonds
A molecule
Ionic compounds do not form
True molecules
What is Avogadro’s Number?
6.022 * 10^23
The law of constant composition states that
All samples of a given compound contain the same elements in identical mass ratios
What is the percent composition?
Mass percent of element / Formula weight of compound all multiplied by 100
The limiting reactant is the reactant with
Fewer moles
What is the equation for percent yield
Actual / Theoretical * 100
To determine a molecular formula, what must be calculated?
The empirical mass of a compound
What is less, the actual or theoretical yield?
Theoretical yield