Need help asap ;) pls do explanations

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

How many moles of oxygen react with 12 moles of aluminum

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.