Exodus is the 2nd book of the Old Testament and the 2nd book of the Law. It has 40 chapters. In the Hebrew Bible, Exodus is part of the תּוֹרָה (Torah, or Law).
The book of Exodus begins with the events leading up to Moses' birth, recorded in Exodus 2:1 and estimated by Dr. Paul Benware to have taken place in 1525 BC. For forty years, Moses lives in Pharaoh's court in Egypt; for another forty, he is in exile in Midian. Exodus covers these periods only briefly, however; the vast majority of the book covers the eponymous event in which the people of Israel leave the land of Egypt and the first two years or so of their journey to the Promised Land. Benware dates the Exodus to around 1445 BC; if this date is correct, the book covers events through around 1443 BC.