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What is the percent yield if 122 grams of SiO2 are made from 246 g of Cr2O3 by the following equation? 3 Si(s) + 2 Cr2O3(s) → 3 SiO2(s) + 4 Cr(l)
Preexisting Duty Rule
A principle in contract law stating that performing or promising to perform a duty already owed under contract does not constitute valid consideration for a new promise.
Unforeseen Difficulties
Unexpected challenges or obstacles that were not anticipated, making a task or goal harder to achieve.
Preexisting Duty
An obligation that a party is already legally bound to perform, which cannot serve as consideration for a new contract.
Foreseen Difficulty
An anticipated challenge or problem that can be predicted based on current knowledge or trends.
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