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Which is the layer underground where all empty spaces are filled with a combination of air and water ?
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If one fission reaction of a uranium-235 atom produced two neutrons, how many neutrons would be released if the chain reaction occurred three more times?
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How many moles of potassium are needed to react completely with 12.8 moles of magnessium bromide?
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One mole of any gas takes up how much space at stp...
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