Since butane is not found on the periodic table, how could you find the molar mass of butane(mass of one mole of butane molecules)?

All you do is add up the molar masses of the carbons and hydrogens in the formula. Most peiordic tables show the molar masses of elements (also called their molecular weights) underneath their chemical symbols. 

4(molar mass of carbon) + 10(molar mass of hydrogen) = 4(12.0107 g/mol) + 10(1.00794 g/mol) 

= 58.1222 g/mol 

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I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.