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# Chem Test Ch 6

Term | Definition |
---|---|

average atomic mass | the weighted average of the masses of all the isotopes of an element |

mole (mol) | the number equal to the number of carbon atoms in exactly 12 grams of pure (12)C NUMBER FROM PERIODIC TABLE |

1 mol of X | 6.02 x 10^23 X |

Avogadro's number (def) | the number equal to the number of carbon atoms in exactly 12 grams of pure (12)C; the number of atoms in exactly one mol |

Avogadro's number | 6.02 x 10^23 atoms |

mass percent | the percent by mass of a component of a mixture or an element in a compound |

STP | standard temperature and pressure - conditions at which one mole of any gas will occupy 22.4 L of space |

molar mass | the mass (in grams) of 1 mol of the substance, obtained by summing the masses of each of the component atoms |

empirical formula | the formula of a compound expressing the smallest whole-number ratio of atoms in a compound - simplest form |

molecular formula | the actual formula of a compound giving the types of atoms and the numbers of each type of atom |

hydrate | a compound that contains a definite amount of water in its crystal structure |

anhydrous | substance containing no water |

H2O of hydration | water that has been evaporated |

1 mol (L) | 22.4 L |

1 mol (molecules/particles/formula units/atoms) | 6.02 x 10^23 |

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meg.minor.15