Under the right conditions. Hydrogen and Oxygen react to form steam. What volume of Oxygen would be required to react with excess hydrogen to produce 672 cm’3 of steam if
the volumes are measured at stp?

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

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yes the answer is total mass in unchanged   : )