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OpenStudy (anonymous):

if you burn 51.4g of hydrogen and produce 459 g of water, how much oxygen reacted

OpenStudy (jfraser):

We have to assume that all of the hydrogen went into making the water, so all that mass is still there, now just part of something larger. IF you started with 51.4g of hydrogen, and made 459g of water, that 51.4g hydrogen is now part of the water. The other part (the difference) must be the oxygen that went into making the water in the first place

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