- How many grams of water are made from the reaction of 4.0 grams of hydrogen gas? 2H2 + O2 -> 2H2O?

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Calculate the mass of butane needed to produce 88.2 g of carbon dioxide.? Functions problem plus an explanation with the answer would really help so i know how to solve the next one? Plant trees on the polar caps of mars so that an ecosystem can start causing greenhouse effect trapping oxygen on the planet? What is the economic life span of water cooled medium sized chillers for office use 5 days a week operating hours 8:00 AM to 5:00PM? Need help answering this math problem.?