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Among the following, choose the ones with equal number of atoms [NEET 2025]
Choose the correct answer from the options given below:
Choose the correct answer from the options given below:
- a)B, C, and D only
- b)B, D, and E only
- c)A, B, and C only
- d)A, B and D only
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
Among the following, choose the ones with equal number of atoms [NEET...
Equal Number of Atoms
- The number of atoms in a given sample depends on the number of moles of molecules present, as well as the number of atoms in each molecule.
- The number of moles can be calculated using the formula:
- Moles = Mass / Molar Mass
- Once the moles are determined, the number of molecules can be calculated using Avogadro's number:
- Number of molecules = Moles × 6.022 × 1023
- To calculate the total number of atoms, multiply the number of molecules by the number of atoms in the molecular formula.
For each option, calculate the number of moles and the total number of atoms:
A. 212 g of Na2CO3
:- Moles = 212 / 106 = 2 moles
- Na2CO3 contains 6 atoms per molecule (2 Na, 1 C, 3 O).
- Total atoms = 2 × 6 × 6.022 × 1023 = 72.264 × 1023 atoms
B. 248 g of Na2O
:- Moles = 248 / 62 = 4 moles
- Na2O contains 3 atoms per molecule (2 Na, 1 O).
- Total atoms = 4 × 3 × 6.022 × 1023 = 72.264 × 1023 atoms
C. 240 g of NaOH:
- Moles = 240 / 40 = 6 moles
- NaOH contains 3 atoms per molecule (1 Na, 1 O, 1 H).
- Total atoms = 6 × 3 × 6.022 × 1023 = 108.396 × 1023 atoms
D. 12 g of H2
:- Moles = 12 / 2 = 6 moles
- H2 contains 2 atoms per molecule (2 H).
- Total atoms = 6 × 2 × 6.022 × 1023 = 72.264 × 1023 atoms
E. 220 g of CO2
:- Moles = 220 / 44 = 5 moles
- CO2 contains 3 atoms per molecule (1 C, 2 O).
- Total atoms = 5 × 3 × 6.022 × 1023 = 90.33 × 1023 atoms
Comparing the total atoms A, B, and D have equal total atoms (72.264 × 1023).
Therefore, the correct answer is Option 2: A, B, and D only.
Therefore, the correct answer is Option 2: A, B, and D only.
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