In a combustion of methane, 4.0g of CO2 was produced. How much methane was combusted? I'll give #1!!!

What element breaks down into yttrium-90?

Substance x has a fixed volume, and the attraction between its particles is strong .substance y had widely spread out particles and can be compressed what can most likely be concluded about these substances

If a reactant was removed, did the new equilibrium system shift to make more reactants or more products?