The mass of a single copper atom (Cu = 63.5) in grams is (use $N_{A} = 6.02 \times 1 0^{23} mo l^{- 1}$ ):

Answer: C

Mass of one atom

= M / N_{A} = 63.5/ (6.02 \times 1 0^{23}) = 1.055 \times 1 0^{- 22} g

. The second option is this value expressed in kg, not g.

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