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asked Aug 20, 2021 30.6k views

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3 votes

Answer:

The answer is "Option b".

Step-by-step explanation:

$\to \text{number of moles} = \frac{\text{number of atoms}}{\text{avogadro number}}$

$= (7.0 * 10^(19))/(6.0221 * 10^(23))\\\\= 1.16 * 10^(-4) \ moles\\\\ =1.2 * 10^(-4) \ moles$

$\to \text{sample mass}= \text{number of moles} * \text{molar mass}$

$=1.16 * 10^(-4)* 58.9\\\\=0.00685 \\\\ = 6.85\ g$

Shonzilla answered Aug 26, 2021

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