How far is mercury from the sun in kilometers?

Of the eight planets, Mercury is the planet closest to the sun. It is about 36 million miles away from the sun. During the day it is extremely hot. During the night it is bitter cold because Mercury doesn't have any atmosphere to keep its heat from escaping.

Atmosphere - Layer of air.

Mercury is around 57,936,384 kilometers away from the sun.

separation of church and state? not sure what you mean.