The absolute humidity at atmospheric pressure at 30 ° C is 0.019 kg water / kg dry air. Determine the water vapor partial temperature pressure, relative humidity and dew point temperature

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Will the boiling point of a pure substance vary if taken on different days? Why? In what ways is the determination of the boiling point of a substance useful?   please answer numbers 1 and 2.... thank you

Calculate and report the density, in kg m-³, of air at 1.00 atm and 10.0 °C. Take the composition of air to be 79 mol% nitrogen and 21.0 mol% oxygen. The molecular weights of nitrogen and oxygen may be taken as 28.0 g mol-¹ and 32.0 g mol-¹ respectively. State any assumptions.

Which of the following has the lowest freezing point? A) H2O B) N2 C) SO2 D) H2 E) CO2

6-17. The molar volumes of a dry gas, measured at 200°F, are given below. What is the coefficient of isothermal compressibility of the gas at 900 psia and 200°F? Pressure, psia Molar volume, cu ft/lb mole 600 700 800 900 1000 1100 1200 10.6 9.7 8.9 8.4 8.1 7.9 7.8

5. How many SCF of an ideal gas are required to fill a (100 ft') tank to a pressure of (40 psig) when the temperature of the gas in the tank is (90 °F)?

As shown below, one side of a rigid, insulated container initially holds 2 m3of air at 27oC, 0.3MPa. The air is separated by a thin membrane from an evacuated volume of 3 m3. Owing tothe pressure of the air, the membrane stretches and eventually bursts, allowing the air to occupythe full volume. Assuming the ideal gas model for the air, determine:a) The mass of the air, in kg.b) The final temperature of the air, in K.c) The final pressure of air, in MPa.

A rectifying column consists of a tube arranged vertically and supplied at the bottom with a mixture of benzene and toluene as vapor. At the top, a condenser returns some of the product as a reflux which flows in a thin film down the inner wall of the tube. At one point in the column, the vapor contains 60 mol% benzene and the adjacent liquid reflux contains 51 mol% benzene. The temperature at this point is 92°C. Assuming the diffusional resistance to vapor transfer to be equivalent to the diffusional resistance of a štagnant vapor layer 0.5 mm thick, calculate the rate of interchange of benzene and toluene between vapor and liquid. The molar latent heats of the two materials can be taken as equal. The vapour pressure of toluene at 92°C is 44.0 kN/m2 and the diffusivity of the vapors is 0.053 cm?/s.

Suppose that the atmosphere were perfectly uniform, witha density throughout equal to that of air at 0°C, 1.3 g L-1. Calculate the thickness of such an atmosphere that would cause a pressure of exactly 1 standard atm at the Earth’s surface.