Name:

CE $2633$

$(2$ points$)$ A temporary bus stop was located next to the air intake for a lecture hall. The air flows

through a $1$ meter wide, square duct directly from the intake to the lecture hall, a distance of $500$

meters. The constant idling of buses has created a CO concentration of $1000m\frac{g}{m^3}$ outside. If the air

flows through the ducts with a velocity of $0\mathrm{.}4\frac{m}{s},$ and the CO reacts to form $C{O}_2$ with a first order

rate constant $k=0\mathrm{.}7mi{n}^{-1},$ what is the concentration of CO in the air entering the classroom?

$(2$ points$)$ The cooling system at Google's server location discharges $400$ L of water at $50C$ to a cooling

pond. What is the enthalpy loss if the water cools to a final temperature of $30C?$ The density of water

is $1000k\frac{g}{m^3}$ and the specific heat of water is $4\mathrm{.}186\frac{kJ}{kg*K}.$