What mass of C3H8 is needed to react with excess O2 to produce 10.8 g of water?

Nonpoint source pollution is difficult to control because it

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.

What are the trends and exceptions to the trends in electron affinity?