(A) The molar mass of $SO_2Cl_2$ is calculated as: $32 + (2 \times 16) + (2 \times 35.5) = 32 + 32 + 71 = 135 \ g/mol$. Number of moles of $SO_2Cl_2 =

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(A) The molar mass of $SO_2Cl_2$ is calculated as: $32 + (2 \times 16) + (2 \times 35.5) = 32 + 32 + 71 = 135 \ g/mol$. Number of moles of $SO_2Cl_2 = \frac{\text{Given mass}}{\text{Molar mass}} = \frac{13.5 \ g}{135 \ g/mol} = 0.1 \ mol$. Total number of molecules = $\text{Number of moles} \times N_A = 0.1 \times N_A = 0.1 \ N_A$.