The mass of 2 moles of electrons is:
Correct answer: C. 1.09 mg
- A. 1.008 mg
- B. 0.55 mg
- C. 1.09 mg
- D. 0.275 mg
Explanation
The mass of one mole of electrons is approximately 5.48579909070 × 10-4 grams. To find the mass of two moles of electrons, we multiply the mass of one mole by 2:(5.48579909070 × 10-4 g/mol) x 2 mol = 0.00109715981814 gramsConverting grams to milligrams, we get:0.00109715981814 g x 1000 mg/g = 1.09715981814 mgTherefore, the mass of two moles of electrons is approximately 1.09715981814 milligrams.
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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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