How many atoms can be found in 3.91 moles of xeno?

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

Which of the following natural processes is most likely to support the formation of an underwater sinkhole? a pollution buildup from deposited minerals b limestone cave collapsing due to changes in sea level c erosion of large amounts of sand moved by ocean waves d oxidation of rock formed by chemical weathering

Convert .347 kilometers to miles show your work