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The number of atoms in 0.1 mol of a triatomic gas is:

1. 0.1 × 3 × 6.023 × 10^23
2. 1.806 × 10^23
3. 6.023 × 10^23
4. 3 × 6.023 × 10^23

Correct answer: 0.1 × 3 × 6.023 × 10^23

Solution

A triatomic gas contains 3 atoms per molecule. In 0.1 mol, the total number of molecules is 0.1 × 6.023 × 10^23. Multiplying this by 3 gives the total number of atoms: 0.1 × 3 × 6.023 × 10^23.

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