• question_answer ${{N}_{2}}O$ and $C{{O}_{2}}$ have the same rate of diffusion under same conditions of temperature and pressure. Why?

Both have same molar mass (= 44 g $mo{{l}^{-1}}$). According to Graham's law of diffusion, rates of diffusion of different gases are inversely proportional to the square root of their molar masses under same conditions of  temperature and pressure.