0.5 mole of H2O is formed when one gram of H2 react with how many grams of oxygen?
Correct answer: B. 8.
- A. 4.
- B. 8.
- C. 16.
- D. 32.
Explanation
H2 + O -> H2O =>O : H2O 1 : 1 X : 0.5 X= 0.5 mol of O atom => Mole=Mass/Mr Mass=Mole x Mr Mass= 0.5 x 16 Mass= 8 g.
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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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