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# Atomic Masses

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

What is the definition of Relative Atomic Mass? | The weighted mean mass of an atom of an element compared with one-twelfth of the mass of an atom of Carbon-12. |

What is the definition of Relative Isotopic Mass? | The mass of an atom of an isotope compared with one-twelfth of the mass of a Carbon-12 atom. |

What is the definition of Relative Molecular Mass? | The weighted mean mass of a molecule compared to one-twelfth of the mass of an atom of Carbon-12. |

What is the definition of Relative Formula Mass? | The weighted mean mass of a formula unit compared with one-twelfth of an atom of Carbon-12. |

What is the formula of Sodium Hydroxide? | NaOH |

What is the formula of Ammonia? | NH3 |

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stu038078