The flow rate of $\mathrm{CO}_{2}$ in a $6 \mathrm{in}$. ID pipeline is measured by an orifice meter with a diameter of $5 \mathrm{in}$. The pressure upstream of the orifice is $10 \mathrm{psig}$, and the pressure drop across the orifice is $30 \mathrm{in} . \mathrm{H}_{2} \mathrm{O}$. If the temperature is $80^{\circ} \mathrm{F}$, what is the mass flow rate of $\mathrm{CO}_{2}$ ?