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If two atoms of hydrogen are used as a reactant, the law of conservation of mass dictates that the total number of hydrogen atoms in the products must also be two. This means that the number of hydrogen atoms remains the same before and after the reaction, so two atoms of hydrogen must be part of the product.

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Q: According to the law of conservation of mass if two atoms of hydrogen are used as a reactant how many atoms of hydrogen must be part of the product?
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