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What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

What kind of ion is contained in salts that produce an acidic solution? a positive ion that attracts a proton from water a positive ion that releases a proton to water a negative ion that attracts a proton from water a negative ion that releases a proton to water

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure