In a chemical reaction a substance decomposes at a rate proportional to the amount present. If an initial amount of substance reduces to 8 grams after 2 hours, and only 3 grams remain after 5 hours, how many grams of the substance were initially present?
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Answer:
23 grams.
Step-by-step explanation:
2hours=-8grams
5hours=3grams
8+8+(8/2)+3=
16+4+3=
23grams were initially present.
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