Acts.
The 5th book of the 'Old Testament'(Hebrew Scriptures) is Deuteronomy The 5th book of the 'New Testament'(Greek Scriptures) is Acts
The book of Mark is the second book in the new testament.
The book of Ephesians is found in the New Testament.
The book of Galatians is found in the New Testament.
The works of the apostles are listed in The Acts of the Apostles book in the New Testament. It is the fifth book in the New Testament.
It is the first book in the New Testament.
The second book in the new testament is Mark.
The first book in the New Testament is the Gospel of Matthew.
The second book of the New Testament is the Gospel of Mark.
The book of 1st Corinthians is found in the New Testament.
The two books in the New Testament that begin with the letter "Z" are the Book of Zephaniah and the Book of Zechariah. However, Zephaniah is actually part of the Old Testament, while the relevant book in the New Testament is the Book of Revelation, traditionally attributed to John. Therefore, the only book in the New Testament that starts with "Z" is Zechariah, which is not a New Testament book; thus, there are no books starting with "Z" in the New Testament.
The fifth book of the old testament is the fifth book of Moses called Deuteronomy.