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# Formulas & Equations

### Chemistry Chapter 3

Question | Answer |
---|---|

the sum of the atomic masses of all the atoms in a molecule | molecular mass |

the sum of the atomic masses of all atoms in a formula unit of a compound | formula mass |

the quanitity of a given substance that contains as many molecules or formula units as the number of atoms in exactly 12 g of carbon-12. The amount of substance containing Avogadro's number of molecules or formula units. | mole (mol) |

the number of atoms in a 12-g sample of carbon-12, equal to 6.02 x 10^23 to three significant figures | Avogadro's number |

the mass of one mole of substance. In grams, it is numerically equal to the formula mass in atomic mass units. | molar mass |

the mass percentages of each element in a compound. | percentage composition |

parts per hundred parts of the total, by mass | mass percentage |

the formula of a sub-stance written with the smallest integer (whole-number) subscripts | empirical (simplest) formula |

the calculation of the quantities of reactants and products involved in a chemical reaction | stoichiometry |

the reactant that is entirely consumed when a reaction goes to completion | limiting reactant (reagent) |

the maximum amount of product that can be obtained by a reaction from given amounts of reactants | theoretical yield |

the actual yield (experimentally determined) expressed as a percentage of the theoretical yield (calculated) | percentage yield |