I think the problem with that is that you don't know how many embryos will be created during the in vitro process. But I'm quickly getting out of area of expertise here and will defer to others.
Depends how many eggs are used.
One egg, max of one embryo.
But they usually like to do lots at once 'cause they can always throw the rest of the embryonic humans away, or freeze 'em, or experiment on 'em.
And to answer another question, while the embryonic humans might be destroyed anyway, that's not a good reason for government to APPROVE and FUND an equally gruesome practice of experimenting on and destroying embryonic humans.