How many nm are in 0.0000521 hm?

Answer 1

The prefix h- is for hecto- meaning 102. The prefix n- is for nano- meaning 10-9:

(0.0000521 hm)* (102 m / hm) / (10-9 m / nm) = 0.0000521 x 1011 nm =

5.21 x 106 nm or 5,210,000 nm