What is the mass of 2.10 x 1021 atoms of copper,Cu?

Question

Quizplus · Accepted Answer

To find the mass of 2.10 x 10^21 atoms of copper, we first need to find the atomic mass of copper (Cu). The atomic mass of copper is 63.5 g/mol. 
Next, we need to convert the given number of atoms into moles by dividing it by Avogadro's number (6.02 x 10^23):

2.10 x 10^21 atoms / 6.02 x 10^23 atoms/mol = 0.00349 mol

Finally, we can find the mass of copper by multiplying the number of moles by the atomic mass:

0.00349 mol x 63.5 g/mol = 0.222 g

Therefore, the mass of 2.10 x 10^21 atoms of copper is 0.222 g, which corresponds to choice C.

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