If a single ordinance makes a number of amendments to the charter and the council chooses to allow citizens to vote on the amendments, can the amendments be separated on the ballot?

For example, if the ordinance changes the size of the council and also gives the mayor the right to vote on all issues, can there be a separate referendum on each of those changes?
Probably not. The statute specifies that the purpose of the referendum is to submit "the ordinance to a vote," which suggests that the vote must be on the ordinance as a whole. If the council wishes to have a referendum on each separate proposed change, it must adopt a separate ordinance for each change.