A gas stream consists of $80.0\%$ nitrogen ($N_2$, molar mass $28.0 \text{ g/mol}$) and $20.0\%$ oxygen ($O_2$, molar mass $32.0 \text{ g/mol}$) by mole. If the total molar flow rate is $25.0 \text{ mol/s}$, convert this to mass flow rate in kilograms per hour ($\text{kg/h}$)?