Plea me in this 4 question

What does the cell nucleus do or, how does it function?

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Which is a characteristic of the electron sea model for metallic bonding? molecular orbitals overlap to produce bands. electrons flow easily between metal nuclei. electrons are in fixed positions in the orbitals. atomic nuclei are arranged in an irregular pattern.