The total number of neutrons in 5g of H2O are:1 NA = 6.023 x 10^23
Correct answer: C. 1.34 x 10^24
- A. 25 NA
- B. 1.1 NA
- C. 1.34 x 10^24
- D. 0.5 NA
Explanation
To find the total number of neutrons in 5g of H2O, we start by calculating the number of moles of water:1. The molar mass of H2O is approximately 18 g/mol (2 for H and 16 for O).2. The number of moles in 5g of H2O is calculated as follows: Number of moles = mass (g) / molar mass (g/mol) = 5g / 18 g/mol ≈ 0.278 moles.3. Each molecule of H2O contains 2 hydrogen atoms (each with 0 neutrons) and 1 oxygen atom (with 8 neutrons), totaling 8 neutrons per molecule.4. The total number of molecules in 0.278 moles is: 0.278 moles x 6.023 x 1023 molecules/mole ≈ 1.67 x 1023 molecules.5. Therefore, the total number of neutrons in 5g of H2O is: 1.67 x 1023 molecules x 8 neutrons/molecule = 1.34 x 1024 neutrons, which corresponds to Option C. The other options are incorrect due to miscalculations or misunderstandings of stoichiometric principles.
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