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Which contains the LARGEST number of atoms?
A1 g of NaCl
B1 g of O2
C1 g of CO2
D1 g of H2
Answer & Solution
Correct answer: A. 1 g of NaCl
1. Atoms count depends on moles and atoms per molecule.
2. 1 g H2 = 0.5 mole; H2 has 2 atoms; total = 1 mole of atoms = 6.022e23.
3. 1 g O2 = 1/32 mole; 2 atoms per molecule; total = 2/32 = 0.0625 mole.
4. 1 g CO2 = 1/44; 3 atoms per molecule; total = 3/44 = 0.068 mole.
5. 1 g NaCl = 1/58.5; 2 ions; total = 2/58.5 = 0.034 mole.
6. So 1 g of H2 contains the most atoms.
_Source: Selina Concise Chemistry ICSE Class 10, Ch 5 'Mole Concept and Stoichiometry'_
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