Okay, I'll play.
The Senate rules give powers to the President pro tempore. These powers are scattered throughout the Senate rules. But are a few of them are, calling votes, appointing chairs, opening and closing the Senate. Now if you would read teh link that I provided, you would find that everytime the President pro-tempore is mentioned, his powers are given in absence of the
Vice President. That means that all powers of the President pro tempore are the Powers of the Vice President.
President pro tempore of the United States Senate - Wikipedia, the free encyclopedia