.How many moles of NO are needed to produce 12 moles of NO2?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

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Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)