La is element 57 on the periodic table a sample contains 2.82 * 10€25 power atoms of La calculate the amount of LA

Question

La is element 57 on the periodic table a sample contains 2.82 * 10€25 power atoms of La calculate the amount of LA

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RuslanHeatt 6 months 2021-07-18T11:17:47+00:00 1 Answers 2 views 0

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    2021-07-18T11:19:04+00:00

    Answer:

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

    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*\frac{1molLa}{6.022x10^{23}atomsLa}=46.8molLa\\\\m=46.8molLa*\frac{138.9gLa}{1molLa}  =6.50x10^3gLa

    Regards!

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