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Gregg Kellogg · Answer 1 · 2022-06-16T18:22:37+0000

Answer:

$n=46.8molLa\\\\m=6.50x10^3gLa$

Step-by-step explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to calculate both moles and grams of lanthanum by using the Avogadro's number as a relationship of atoms to moles and its atomic mass as a relationship to moles to grams to obtain the following:

$n=2.82x10^(25)atomsLa*(1molLa)/(6.022x10^(23)atomsLa)=46.8molLa\\\\m=46.8molLa*(138.9gLa)/(1molLa) =6.50x10^3gLa$

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