1.The partial pressure of the gasses in a 22,414-L volume of air at STP are: oxygen, 21,224 kPa; nitrogen, 79,119 kPa; argon, 0.946 kPa; and carbondioxide, 0.036 kPa. Determine the gram molecular weight of air.
2.Calculate the alkalinity as CaC03 of water that contains 85mg/l of HCO3, 120 mg/l of CO3 and 2 m/l of OH.
3.Select the lightest available W14 section to support the axial compression dead load of PD= 140 k and a live load of PL = 120 k if the length is equal to 14 ft and A992 steel is used. Assume that the top is unbraced (sidesway uninhibited), both ends are fixed, and there is no bracing along the length of the member.