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            <video:description>Une mole d&#39;une substance est égale à 6,022 × 10²³  unités de cette substance (tels que les atomes, les molécules ou les ions). Le nombre 6,022 × 10²³ est connu sous le nom de nombre ou constante d&#39;Avogadro. Le principe de la mole peut être utilisé pour la conversion entre la masse et le nombre de particules.</video:description>
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            <Attribute name="description">La masse molaire d&#39;une substance est la masse, en grammes, d&#39;une mole de cette substance. Cette vidéo montre comment trouver la masse molaire d&#39;un composé à partir des masses molaires des atomes qui le constituent. On montre ensuite comment passer de la masse d&#39;un échantillon au nombre de moles qu&#39;il contient, en s&#39;aidant de cette masse molaire.</Attribute>
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            <video:description>La masse molaire d&#39;une substance est la masse, en grammes, d&#39;une mole de cette substance. Cette vidéo montre comment trouver la masse molaire d&#39;un composé à partir des masses molaires des atomes qui le constituent. On montre ensuite comment passer de la masse d&#39;un échantillon au nombre de moles qu&#39;il contient, en s&#39;aidant de cette masse molaire.</video:description>
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