Which sample contains the largest number of atoms?
Correct answer: A. 1 mg of C4H10
- A. 1 mg of C4H10
- B. 1 mg of N2
- C. 1 mg of Na
- D. 1 mg of H2O
Explanation
The correct answer is 1 mg of C4H10 because it has the highest total number of atoms (14 atoms per molecule). To find the number of atoms in each sample, we first convert the mass to moles using the respective molar masses, then multiply the number of moles by the number of atoms per molecule. The other options contain fewer total atoms based on their molecular structure and mass: N2 has only 2 atoms, Na has 1 atom, and H2O has 3 atoms.
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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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