2 grams of H2 molecules contain _ molecules.
Correct answer: B. 6.02 x 10^23
- A. 12.04 x 10^23
- B. 6.02 x 10^23
- C. 3.01 x 10^23
- D. 1.008
- E. 2
Explanation
1 mole of hydrogen contains = 2×1 = 2g2g of H2 contain = 2/2 × avogadro number = 1 × 6.022 × 10²³ = 6.022 × 10²³ molecules.
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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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