The mass of O2 required to burn 0.1 mole of C2H5OH is:
Correct answer: D. 9.6 g
- A. 32 g
- B. 3.2 g
- C. 5.6 g
- D. 9.6 g
Explanation
Balanced Chemical Equation:C2H5OH +3O2 ----------- 2CO2 + 3H2OFrom balanced chemical equation, the ratio between C2H5OH and O2 is 1:3. This means ethanol reacts with 3 moles of oxygen.Moles of O2= 3(moles of C2H5OH) Moles of O2=3(0.1) Mass of oxygen= moles(molar mass) =3(0.1)(32)=9.6gSo option D is the correct answer.
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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