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- When 184. mg of a certain molecular compound X are dissolved in 85. g of formamide (NH,COH ), the freezing point of the solution is measured to be 1.7 °C. Calculate the molar mass of X. If you need any additional information on formamide, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to the correct number of significant digits. Ox10 미133 - 107 ethyl ether ethyl alcohol 80 53 water 27 ' ethylene glycol 20 40 60 80 100 120 Temperature (°C) University of Wisconsin, https://wisc.pb.unizin.org/minimisgenchem/chapter/vapor-pressure- m10q3/ Reference the vapor pressure diagram above with the table below, which provides the chemical formulas for the four substances: Substance Name Chemical Formula Water H20 Ethyl ether (CH3CH2)20 Ethylene glycol (CH2OH)2 Pressure (kPa)Consider this information regarding two compounds. Thallium azide: yellow crystalline solid; melting point = 330 C; slightly soluble in water, more soluble in hot water; insoluble in ethanol or diethyl ether. Camphene: colorless, cubic crystals; melting point = 51 C; boiling point = 159 C; insoluble in water; moderately soluble in ethanol; soluble in diethyl ether. (a) Is camphene an ionic or molecular compound? Explain your answer. (b) Is thallium azide an ionic or molecular compound? Explain your answer.
- 1)The production of authentic tequila is restricted to the blue agave and a defined geographical area in west-central Mexico. Two basic categories of tequila can be distinguished: “100% agave” and “mixed” tequila. High-quality “100% agave” tequila uses pure agave juice for fermentation and Mexican law states that these authentic tequilas must be bottled in Mexico. A mixed tequila is manufactured by adding up to 49% (w/v) of sugar from sugar cane for fermentation. The low-quality tequila is usually shipped in bulk containers for diluting and bottling in the importing countries. Due to frequent fraud in the labeled quality of tequila, there is a need to verify the authenticity of a tequila using chemical analysis. Figure 1 shows an ion chromatogram for an authentic 100% agave tequila and a commercial mixed tequila. The difference in anion content is due to the different sources of water used in final dilution and bottling steps. a) In reversed-phase liquid chromatography, a…True or False: In the future, locally-grown maple syrup will likely become more available in the Midwest.1:44 PM 169% Constant No relationship Describing the relationship between the melting time for an ice cube and amount of salt sprinkled on the cube by writing about it or by constructing a graph, is an example of Communicating Inferring Hypothesizing Observing After observing the melting rates of an ice cube sprinkled with salt and one without salt, concluding that salt reduces the freezing point of water, is an example of Inferring Hypothesizing Observing Predicting
- Write the chemical equation for the dissociation of butanoic acid (C3H7COOH) in water. Include the phases of all species in the chemical equation.Е. NaCN Br Acetone1. 250.0 g each of toluene (CoHsCH:) and benzene (CsHs) are mixed together. Answer the following questions. C&H6 C6HSCH3 Compound M (g/mol) Kr (°C/m) | TP (°C) | Kb(C/m) 5.12 7.27 78.108 93.142 5.55 -95.0 2.53 3.29 To (°C) 81.1 110.7 (a) In this solution, which is the solute and which is the solvent? (b) What is the freezing point of this solution, in °C? (c) What is the boiling point of this solution, in °C? (d) Calculate the osmotic pressure of this solution in kPa. Assume that the masses are additive and the density of the final solution at 25°C is 0.867 g/mL.
- TRUE OR FALSE A student synthesizing an organic compound from 2 starting materials. it is determined that starting material X is in excess while starting material Y is the limiting reagent. It is imperative that the measurements of Y are precise in order to determine the correct number of significant figures in the calculation of the theoretical yield Distillation is used in organic chemistry to both purify a compound and determine its approximate boiling point.Petroleum chemistryThe position of the phases in the separatory funnel (whether the top or bottom phase) is dependent on the relative densities of the solvents. Complete table 1 to indicate whether each of the solvents will be on the top or bottom layer. Table 1. Solubility properties of common organic solvents. Solubility in H20 (g/L, 20-25°C) 9.5 x 10-3 1.79 8.09 17.5 Solubility of H20 (g/L, 20-25°C) 0.31 Phase layer Density (g/mL, 25°C) 0.661 Liquid hexane benzene chloroform 0.76 0.87 1.76 15 170 0.877 dichloromethane diethyl ether 1-butanol 60.5 73 0.3 1.489 1.327 0.713 0.81 0.83 1-octanol 49 ethyl acetate 83 33 0.902
