Proportions and Percent Proportions

The law of definite proportions states that a given chemical compound always contains the same _ in the exact same _ by mass.

• elements, compounds

• elements, molecules

• elements, proportions

• proportions, elements

the ratio of the mass of each element to the total mass of the compound, expressed as a percent (%)

• element

• law of multiple proportions

• law of definite proportions

• percent by mass

Definition: different compounds are formed by a combination of the same elements; different masses of one element combine with the same fixed mass of the other element in a ratio of small whole numbers

• element

• law of multiple proportions

• law of definite proportions

• percent by mass

The ratio of the number of atoms of each element in a compound to the total number of atoms, expressed as a percent (%)

• mole ratio

• law of definite proportions

• percent composition

• atomic number

In a chemical reaction, the ratio of the amount of product formed to the amount of reactant used, expressed as a percent (%)

• percent yield

• molar mass

• stoichiometry

• reaction rate

The principle stating that in a chemical compound, the elements are always combined in the same proportion by mass

• law of conservation of mass

• law of definite proportions

• law of multiple proportions

• Avogadro's law

The concept that different compounds can be formed by the same elements, with the mass of one element combining with a fixed mass of the other in a ratio of small whole numbers

• law of definite proportions

• law of multiple proportions

• percent composition

• mole ratio

The percentage by mass of each element in a compound

• molar mass

• percent composition

• empirical formula

• molecular formula

The ratio of the actual yield to the theoretical yield, multiplied by 100

• percent yield

• percent error

• percent composition

• mole ratio

The mass of one mole of a substance, usually expressed in grams per mole

• molar mass

• atomic mass

• percent composition

• mole ratio