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- 5.Measures to observe when measuring viscous liquids include the following, with exception ofa.Use of silicone treated glassware for smaller volume of liquidsb.Pouring from bottle that is not completely filledc.When pouring, do not allow the liquid to run down the inside surface of the graduatesd.Drainage time is longer6.Most accurate balance to use for pharmaceutical analysisa.Household scaleb.Top loading balancec.Analytical balanceTriple beam balanceIn analysis of an aluminum-zinc alloy, vapor pressure of water from Table 1 is 19.827 mm Hg, mass of alloy sample is 0.1442g, mass of displaced water is 104.3233g, volume of water(table 2) is 104.5565L, volume H2 is 104.5565L, the temperature of H2 is 295Kelvin, pressure of dry H2 is 0.97654 ATM, moles H2 is 4.2158 moles,moles H2/g sample,NH2 is 29.2358 moles/g, Calculate % Al (From Graph).a concentrated H2SO4 has the following composition specific gravity 1.84 and purity of H2SO4 is 97 percent by weight. express in mole/L
- The 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 0.9006 Methods that employ separation of the product chemically through precipitation, with purification, drying and weighing of the resultant product: A. Spectrophotometric analysisB. Volumetric analysisC. Gravimetric analysisD. Gasometric analysis7 Phase changes involving fusion, except:a. Solid to liquidb. Liquid to solidc. Gas to liquidd. Gas to solidIf 10.0mL of H2SO4 (specific gravity=1.50 containing 48.7% of combined SO3 by weight) is diluted to 400mL, what is the normality of the solution as an acid? 1.52 x 10-4 N 3.04 x 10-4 N 0.228 N 0.456 N
- 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.ITEMS USED FOR EXPERIMENT: •Ring stand •Hot plate •125 mL Erlenmeyer flask•400 mL beaker•10 mL graduated cylinder •Aluminum foil•Rubberband•Paper Clip•Thermometer•Vial containing unknown liquid You know have the following data: Mass of flask + foil + rubberband: 78.637 gMass of flask + foil and rubberband+ unknown condensed liquid: 78.847 gTemperature of water bath: 100C = 373 KPressure of gas in our system: 29.02 inHg = 0.9699 atmVolume of gas in our system: 141 mL = 0.141 L 1. During the experiment, you collect the following data: Mass of flask: 80.001 g Mass of flask + unknown condensed liquid: 80.452 g Temperature of water bath: 100 °C Pressure of gas in our system: 0.998 atm Volume of gas in our system: 265 mL Which of the following number(s) need a conversion before they can be used? (Check all that apply) [ ] Group of answer choices [ ] Volume of gas in our system [ ] Mass of flask [ ] Temperature of water bath [ ] Pressure of gas in our system [ ] Mass of flask +…Normality of 20% (w/v) of H2SO4 is
- For a given liquid a plot of the lnP versus 1/T gives a straight line with a slope of -4606 K.What is the ΔHvap of this liquid?What is the mole fraction of magnesium nitrate, Mg(NO3)2, in an aqueous solution that is 5.549 wt % in magnesium nitrate? MW(Mg(NO3)2) = 148.315 g/mol. 5.834e-2 1.721e-1 7.080e-3 9.929e-1Air at 25 oC , 740 mm Hg and 55% Relative Humidity is compressed to 10 atm. To what temperature (oC) must the air-water mixture be cooled if 90 % of the water is to be condensed ?