Mass of the oil that co-distills with each one gram of water at 98 °C: Ptotal = 1 atm = 760 mmHg P°water (98 °C) = 707.3 mmHg P°oil = 760 mmHg – 707.3 mmHg = 52.7 mmHg 1 g H2O x (1 mol H2O)/(18 g H2O) = 0.06 mol H2O P°oil / P°water = moles (oil) / moles (water) (52.7 mmHg) / (707.3 mmHg) = moles (oil) / (0.06 mol H2O) => moles (oil) = 0.00417 mol 0.00417 mol oil x (169 g oil)/(1 mol oil) = 0.705 g oil b)
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The equilibrium constant was found by titrating a series of reactions containing H2O‚ HCl‚ and the unknown ester with only the last solution containing the unknown alcohol. Equilibrium constants can be easily found once the concentrations of all reactants are known using Keq= [ acid][alcohol]/[ester][water]. Procedure: Part A: Prepare six bottles with the following volumes in each: Bottle # 3M HCl in mL H2O in mL Ester in mL Alcohol in mL 1 5 5 0 0 1/A 5 5 0 0 2 5 0 5 0 3 5 1 4 0 4 5
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Rebecca Almonte J.K. Offerman FMM 114 Museum Trip Visit 1920s The 1920s represented a time of tremendous social change‚ which was reflected in fashion as well. For women‚ short bobs because fashionable as did shorter skirts such as pinafores that would never have been allowed in previous decades. There was a certain androgynous look to women’s fashion that borrowed from men’s clothing liberally. Forward thinking designers like Coco Chanel and Jean Patou made sportswear fashionable
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the corporate culture that promotes the hip-hop music most commonly heard on radio and viewed as music videos on television. Since the early 1990s‚ the biggest selling hip-hop artists have been the ones most associated with “gangsta” rap; the “bling-bling” rap that celebrates materialism; and the “big pimping” rap that denigrates women‚ according to Harrison‚ who teaches in the sociology department at Virginia Polytechnic Institute and State University. “It’s the partnership of hip-hop and corporate
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____ O2 ____ H2O 5) ____ Pb(OH)2 + ____ HCl ____ H2O + ____ PbCl2 6) ____ AlBr3 + ____ K2SO4 ____ KBr + ____ Al2(SO4)3 7) ____ CH4 + ____ O2 ____ CO2 + ____ H2O 8) ____ C3H8 + ____ O2 ____ CO2 + ____ H2O 9) ____ C8H18 + ____ O2 ____ CO2 + ____ H2O 10) ____ FeCl3 + ____ NaOH ____ Fe(OH)3 + ____NaCl 11) ____ P + ____O2 ____P2O5 12) ____ Na + ____ H2O ____ NaOH + ____H2 13) ____ Ag2O ____ Ag + ____O2 14) ____ S8 + ____O2 ____ SO3 15) ____ CO2 + ____ H2O ____ C6H12O6
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solution of magnesium hydroxide Mg2+(OH-)2‚ of about pH12. MgO(s) + H2O(l) ==> Mg(OH)2(aq) Reaction of oxide with acids: Behaves as a basic oxide dissolving to form the chloride‚ sulphate and nitrate salt in the relevant dilute acid. MgO(s) + 2HCl(aq) ==> MgCl2(aq) + H2O(l) MgO(s) + H2SO4(aq) ==> MgSO4(aq) + H2O(l) MgO(s) + 2HNO3(aq) ==> Mg(NO3)2(aq) + H2O(l) In all cases the ionic equation is: MgO(s) + 2H+(aq) ==> Mg2+(aq) + H2O(l) Reaction of oxide with strong bases/alkalis: No reaction
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INQUIRY- What is the percentage by mass of water in Epson salt? DISCUSSION- When a crystal forms from water solutions‚ it takes a certain amount of water as part of the crystalline structures. The water is not covalently bonded to the host molecule or ion. Water is taken up in definite proportion in relation to the mass of the crystalline structure. This water that is trapped inside the hydrated solid structure is called water of crystallization or water of hydration. A salt with associated
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again last Valentine’s Day and she wanted to hint for something specific. Finn didn’t. While Rachel examined dozens of rings‚ Kurt tried a few on for the hell of it. He favorite was a platinum eternity band with diamonds all the way around. All that bling is too flashy and something simple and classy is more his style for everyday wear.
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through the filter Slurry- suspension of solid in liquid Calcium ion can be analyzed by precipitation with oxalate in basic solution to form CaC2O4.H2O The precipitate is soluble in acidic solution because the oxalate anion is a weak base CaC2O4.H2O (calcium oxalate monohydrate ; MW = 146 g/mol) Equation: Ca2+(aq) + C2O42-(aq) CaC2O4.H2O Large‚ easily filtered‚ relatively pure crystals of product will be obtained if the precipitation is carried out slowly‚ which can be done by
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strong oxidizer. Hydrogen peroxide is a clear liquid‚ slightly more viscous than water. In dilute solution‚ it appears colorless. Reactions Decomposition Hydrogen peroxide decomposes exothermically into water and oxygen gas spontaneously: 2 H2O2 → 2 H2O + O2 This process is thermodynamically favorable. It has a ΔHo of −98.2 kJ·mol−1 and a ΔS of 70.5 J·mol−1·K−1. The rate of decomposition is dependent on the temperature (cool environment slows down decomposition‚ therefore hydrogen peroxide is often
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