The diameter of a hydrogen atom is 212 pm. Find the length in km of a row of 6.02 x 10^{23} hydrogen atoms. 1 pm = 10 ^{-12} m.

A. 2.41 x 10^{19} km

B. 1.28 x 10^{11} km

C. 3.60 x 10^{12} km

D. 5.59 x 10^{23} km

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