Determine the number of moles of O in 10.6g of Na2CO3:
Correct answer: B. 0.3 moles
- A. 0.4 moles
- B. 0.3 moles
- C. 0.2 moles
- D. None of the given options
Explanation
10.6/106 = 0.1 mol 3 oxygen atoms are present so: 0.1 x 3 = 0.3 mol Hence, option B is correct.
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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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