(A) Given mass of $CO_2 = 44 \ g$. Molar mass of $CO_2 = 12 + (2 \times 16) = 44 \ g/mol$. Number of moles of $CO_2 = \frac{\text{Given mass}}{\text{M

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(A) Given mass of $CO_2 = 44 \ g$. Molar mass of $CO_2 = 12 + (2 \times 16) = 44 \ g/mol$. Number of moles of $CO_2 = \frac{\text{Given mass}}{\text{Molar mass}} = \frac{44 \ g}{44 \ g/mol} = 1 \ mol$. Number of molecules $= \text{Number of moles} \times N_A = 1 \times 6.022 \times 10^{23} = 6.022 \times 10^{23}$ molecules.