Question

A hydrogen atom has a diameter of about 12.7 nm, express this diameter in centimeters.

Answer 1

We have to convert 12.7nm to cm

`\\ \sf\longmapsto 12.7nm`

`\\ \sf\longmapsto 12.7* 10^(-9)m`

`\\ \sf\longmapsto 0.127* 10^(-7)m`

`\\ \sf\longmapsto 0.00000127* 10^(-2)`

`\\ \sf\longmapsto 0.0000013cm`

Answer 2

1 meter = 1e9 nm
To get meters, divide nanometers by 1e9: 9.95nm / 1x10^9 = 9.95x10^-9 meters
Answer: 9.95e-9 meters