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science need help

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2 H2 + O2 = 2H2O
2 grams + 32 grams=_ _ _ _ _grams

how would the mass of water formed in the reaction compare to the mass of oxygen and hydrogeb that reacts.

in your response be sure to:
include they type of change illustrated in the balanced eqaution
explain the conservation of matter and determine the unknown amount of mass
explain the production of water.

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