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Question #ff8b4

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Answer 1 · 2017-09-08T16:36:47

$4.5665 \cdot 10^{- 5}$ $4.5665 * 10^-5$ moles

Explanation:

Your working out doesn't seem to make sense. This is not a difficult problem, if you just calculate the number of protons, then convert the amount to moles.

There are $11$ $11$ protons in a sodium atom, so the are $2.50$ $2.50$ x $10^{18}$ $10^18$ x $11$ $11$ protons altogether: $2.75$ $2.75$ x $10^{19}$ $10^19$ protons.

Number of moles: $\frac{2.75 \cdot 10^{19}}{6.022 \cdot 10^{23}}$ $(2.75 * 10^19)/( 6.022 * 10^23)$

$4.5665 \cdot 10^{- 5}$ $4.5665 * 10^-5$ moles

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