Answer: i would say D or the last one.
Explanation: According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.
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The difference is the amount of oxygen in the compound
Answer I'm not quite sure if this is right, but maybe it's because Jessica put her thermometer deeper in the stream, and Javier put his more up.
Explanation:
