## Chemistry: A Molecular Approach (3rd Edition)

$$198 km = 1.98\times10^7 cm$$
To convert from km to cm, we can first convert kilometers to meters. 1 km = 1000m 198 km = 198000 m Now we can easily convert meters to centimeters. 1 m = 100 cm 198000 m = 19800000 cm = $1.98\times10^7 cm$