A typical virus is 5x10-6 cm in diameter. if avogadro's number of these virus particles were laid in a row, how many kilometers long would the line be?

Answer is: line be long 3,011·10¹³ kilometers.

diametar of virus = 5·10⁻⁶ cm : 100000 = 5·10⁻¹¹ km.

line lenght = 5·10⁻¹¹ km · 6,023·10²³.

line lenght = 3,011·10¹³ km.

Avogadro number = 6,023·10²³.

1 cm = 10⁻² m = 10⁻⁵ km.