(A) The number of moles of $CO_2$ is calculated as $n = \frac{11.2 \, L}{22.4 \, L/mol} = 0.5 \, mol$.The number of molecules of $CO_2$ is $0.5 \times

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(A) The number of moles of $CO_2$ is calculated as $n = \frac{11.2 \, L}{22.4 \, L/mol} = 0.5 \, mol$.The number of molecules of $CO_2$ is $0.5 \times N_A$.Since each molecule of $CO_2$ contains $3$ atoms ($1$ carbon and $2$ oxygen atoms),the total number of atoms is $3 \times 0.5 \times N_A = 1.5 \, N_A$.