A BOD Test is made for awastewater sample at (20°C). BOD, after one day is (50 mg/L), and BOD, after five days is ( 150 mg/L). calculate BOD, of such sample after Incubation for (7 days) at (20°C )?
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- A 9-m3 container is filled with 300 kg of R-134a at 10°C. What is the specific enthalpy of the R-134a in the container?1.1 m3. The mass of the balloon 3. Consider a hot-air balloon with fixed volume VB envelope, whose volume is to be neglected in comparison to VB, is mL balloon shall be started, where the external air temperature is T = 20°C and the normal 0.187 kg. TheA weather balloon calibrated at 0.00 °C to have a volume of 20.0 L has what volume in L at -23.4 °C assuming pressure is held constant? With the correct amount of sig figs
- If a pneumatic cylinder has a volume of 14 cu. in. at 1000 PSIG (1000 Pounds per square inch gauge) when the temperature is 85°F and then the temperature is elefated to 125°F by compression to 12 cu. in. What does the gauge pressure increase to?At STP, The density of chlorine is 3.22 kg/m3. What is the weight of this gas in grams if contained in a flask of 100 cm3 at 24°C and 100 kPa?The vapor pressure is the pressure of the vaporphase of a substance when it is in equilibrium with the solid or liquid phaseof the substance. The relative humidity is the partial pressure of watervapor in the air divided by the vapor pressure of water at that same temperature,expressed as a percentage. The air is saturated when the humidityis 100%. (a) The vapor pressure of water at 20.0 C is 2.34 * 10^3 Pa.If the air temperature is 20.0 C and the relative humidity is 60%, what isthe partial pressure of water vapor in the atmosphere (that is, the pressuredue to water vapor alone)? (b) Under the conditions of part (a), what is themass of water in 1.00 m3 of air? (The molar mass of water is 18.0 g>mol.Assume that water vapor can be treated as an ideal gas.)
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