Elements A and B combine together to form a compound, and in this compound, element A occupies 65% of the mass. A chemist reacts 65 grams of A with 35 grams of B. After the reaction, the chemist finds that all of A has been used, but there is about 9 grams of B remaining. How is this possible?

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Type a concept, like “slope” or “photosynthesis”.

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