Reacting 56 gm of CaO with 63 gm of HNO3 yields ______________ gm of Ca(NO3)2?
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Answer: A. 82
Explanation
Stoichiometric reaction of 56 g of CaO and 63 g of HNO3 produces calcium nitrate and water, yielding 82 grams of Ca(NO3)2. Calculating molar masses shows calcium oxide is 56 g/mol and nitric acid is 63 g/mol. Balanced equations indicate one mole of calcium oxide reacts with two moles of nitric acid to form one mole of product. Stoichiometry involves calculating relative quantities of reactants and products in chemical reactions. Limiting reactant analysis ensures all input materials are accounted for when predicting theoretical product yields. Molar mass of calcium nitrate is determined by summing atomic weights of calcium, nitrogen, and oxygen.
Industrial chemical manufacturing relies on accurate stoichiometric calculations to maximize efficiency and minimize waste. Process engineers calculate theoretical yields to evaluate plant performance and troubleshoot chemical reactor operations. Precipitation and neutralization reactions are common unit processes requiring precise mass balance evaluations. Option b overestimates the calculated product mass by failing to apply correct stoichiometric mole ratios. Option c underestimates the product yield by half due to incorrect reactant consumption assumptions. Option d represents an erroneous decimal placement that contradicts basic chemical mass conservation laws.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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