The mass of one mole of electron is:
Correct answer: C. 0.55 mg
- A. 1.8 mg
- B. 0.184 mg
- C. 0.55 mg
- D. 0.64 mg
Explanation
The mass of one mole of electrons is approximately 0.55 mg. For electrons, the molar mass is calculated based on their atomic mass. The atomic mass of an electron is extremely small, approximately 9.10938356 × 10-31 kilograms. To convert this mass to milligrams (mg) per mole, we can use the conversion factor of 1 kilogram = 1 × 106 mg and Avogadro's number, which is approximately 6.022 × 1023. Calculating the mass of one mole of electrons: (9.10938356 × 10-31 kg) × (1 × 106 mg / 1 kg) × (6.022 × 1023 electrons / 1 mole) ≈ 0.55 mg
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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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