Amount of mixture is sum of amounts of components
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The total amount of the mixture is equal to the sum of the amounts of each of the components.

**Conditions:**

#. Mixture in a closed impenetrable volume, that is, molecules/atoms cannot leave it and
   they are always inside;
#. Mass is not transformed to energy, for example due to annihilation.

**Links:**

#. `Engineering LibreTexts, Composition on a Molar Basis <https://eng.libretexts.org/Bookshelves/Introductory_Engineering/Basic_Engineering_Science_-_A_Systems_Accounting_and_Modeling_Approach_(Richards)/03%3A_Conservation_of_Mass/3.04%3A_Mixture_Composition>`__.

..
    TODO fix file name

.. py:currentmodule:: symplyphysics.laws.conservation.mixture_moles_amount_is_components_moles_amounts_sum

.. py:data:: amount_of_mixture

    :attr:`~symplyphysics.symbols.chemistry.amount_of_substance` in the mixture.

Symbol:
    :code:`n`

Latex:
    :math:`n`

Dimension:
    :code:`amount_of_substance`


.. py:data:: amount_of_component

    :attr:`~symplyphysics.symbols.chemistry.amount_of_substance` in the :math:`i`-th component.

Symbol:
    :code:`n[i]`

Latex:
    :math:`{n}_{i}`

Dimension:
    :code:`amount_of_substance`


.. py:data:: law

    :code:`n = Sum(n[i], i)`


    Latex:
        .. math::
            n = \sum_i {n}_{i}