Calculate the mass of water vapor present in a room of volume 400 m3 that contains air at 290C when the relative humidity is 53.0%. Compute for the vapor pressure of water?
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1. Calculate the mass of water vapor present in a room of volume 400 m3 that
contains air at 290C when the relative humidity is 53.0%. Compute for the vapor
pressure of water?
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- Show complete solutions and enclose all final answers in a box. Round off final answers to 4 decimal places and use floating values for intermediate answers. A gas column is separated into two segments by a non-permeable partition. On the first segment is 1.63 moles of Helium with volume V1 and on the second segment is 3.84 moles of Oxygen gas with volume V2. Consider both gases to be ideal and at the same pressure P and temperature T. If the partition is removed, calculate the change in entropy of the gaseous system.We have already noted two sources of systematic error in the use of this method: not enough sample to displace all the air from the flask and the finite vapor pressure of the unknown. Consider the following possible errors. For each one, describe how the results might be impacted. Please try to be specific (e.g. “The molar mass will be overestimated because…”) The volume of your flask was found by weighing it, filled with water, at room temperature (20ºC). At 100ºC, because of the expansion of glass, the volume is slightly greater. How could this affect your results?Pressure was exerted with a piston on molten naphthalene at 95 °C. The vaporpressure of naphthalene when the applied pressure is 1.0 bar is 2.0 kPa. What is thevapor pressure when the pressure on the liquid is 15 MPa? The mass density ofnaphthalene at this temperature is 1.16 g cm-1.
- A gaseous mixture contains the following (%n/n is percent by mole): 15%n/n O₂, 23%n/n N₂, 4%n/n CH₄, 25%n/n C₂H₆, 6%n/n C₃H₈. The last component not mentioned is butane, C₄H₁₀. Determine the %v/v (percent by volume) of butane in the mixture.A parcel of unsaturated air contains a mixture of dry air and water vapor. The specific humidity q of the air parcel is 12 g kg^−1. Recall that q = Mv / (Mv+Md),where Mv is the mass of the water vapor and Md is the mass of the dry air. This is equivalent to what we have been calling the fractional concentration of water vapor by mass. (a) If the air parcel is at a temperature T= 25◦C , what is the virtual temperature of the air parcel? (b) If the air parcel is at a temperature T= 25◦C and a pressure of 1000 hPa, what is the relative humidity of the air parcel? (c) What is the apparent molar mass of the air parcel?Deviations from ideal behavior occur at low concentrations True or False
- Show calculations for the experimental percentage of water for Trial 1Percentage of Water in Hydrate AverageThe solvent for an organic reaction is prepared by mixing 70.0 mL of acetone (C3H6OC3H6O) with 56.0 mL of ethyl acetate (C4H8O2C4H8O2). This mixture is stored at 25.0 ∘C∘C. The vapor pressure and the densities for the two pure components at 25.0 ∘C∘C are given in the following table. What is the vapor pressure of the stored mixture? Compound Vapor pressure(mmHg) Density(g/mLg/mL) acetone 230.0 0.791 ethyl acetate 95.38 0.900In another day John has to measure the molar mass of a biological sample. Because the sample is not stalble at high or low temperatures, he decides to use osmosis to do the measurement. He adds different amount of the sample in 100 g of water against the other side of the osmometer pure water at room temperature 298.15 K. The pressure difference is measured and listed below. What is the molar mass of the sample? MW = ______ kg/mol. 3 sig. fig. Gas constant R =8.3145 J/K. Copy and paste in Excel to treat and fit the data. Final unit in kg/mol not in g/mol. Mass added in 100 g of water (g) CB (kg/m3) or (g/L) ΔP (Pa) 0 0 0 0.0100 0.1 44.0 0.0200 0.2 124.3 0.0300 0.3 241.4 0.0400 0.4 404.6 0.0500 0.5 606.6 0.0600 0.6 842.3 0.0700 0.7 1123.1
- Crude oil containing 5.0 mole per cent of gasoline is stripped by running the crude down a columnup which live steam is passed so that 15 kmol of steam are used/100 kmol of oil stripped. Determinethe number of theoretical plates required to reduce the gasoline content to 0.05 mole per cent, assumingthat the crude oil is non-volatile. The vapor–liquid relation of the gasoline in the oil is given by ye = 44x,where ye is the mole fraction in the vapor and x the mole fraction in the liquid. The temperature ismaintained constant by internal heating so that steam does not condense in the tower.For a given liquid a plot of the lnP versus 1/T gives a straight line with a slope of -4344 K.What is the ΔHvap of this liquid? Your answer should be in kJ/mol and have 3 sig figs(Note, do not include units on your answer, just a number)Boyle’s law for confined gases states that if the temperature is constant, pv = c, where p ispressure, v is volume, and c is a constant. At a certain instant the volume is 75 cubic inches, thepressure is 30 psi, and the pressure is decreasing at the rate of 2 psi every minute. What is therate of change of the volume at that instant?