Here "you" is plural. Possible meanings are 1) this refers to Jeremiah and those with him, or 2) it refers to all the people. (See: [[rc://en/ta/man/translate/figs-you]])
Here "hand" means power or control. This can be translated in active form. AT: "Yahweh has given it to the king of Babylon" or "Yahweh has given the king of Babylon the power to rule it" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-activepassive]])