A student performed the fractional distillation of a cyclohexane/toluene mixture. The refractive index of the distillate was measured at 1.4301 with an ambient temperature of 22.0°C. What is the mole percentage of cyclohexane (to 3 sf)?
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- How many mL of methadone is needed for a patient who was prescribed 0.015 g of methadone? The vial reads 6 milligrams of methadone per 1 mL of solution.If a researcher forgot to wipe the outside a sample cuvette to make it free of drops, fingerprints, and dust prior to reading it in the spectrophotometer, how might the absorbance value of the sample be affected? (Higher, Lower, No Change) ExplainBesides 1H NMR, FT-IR, melting point, data for refractive index, what other information could you obtain for your compound to assess its’ purity and confirm its’ structure? How would this additional data contribute to your conclusion about the structure of the unknown compound?
- if the absorbance value measured in a spectrophotometer is 0.5, how much of the original incident light is being measured by the detector?Why does one see methyl orange as orange in color? What blank would be used to standardize this spectrophotometer?How many mL of 19 mM SDS would you need to make 76 mL of 2 mM SDS? Report your answer rounded to 1 decimal place.
- If the dehydration reaction of an alcohol is successful, what changes would be seen in the IR spectrum for the product compared to the starting materialA 46.60-gram pycnometer was filled with 100.50 grams of liquid. When filled with insoluble powder, the pycnometer weighs 84.60 grams. When the insoluble powder and liquid were combined, the pycnometer weighed 172.8 grams. What is the relative density of the insoluble powder?Chemical Test Just fill out Table 2 by writing “+” if the compound is soluble/miscible in the solvent. Otherwise, write “-“. Table 2. Data on the results of chemical tests for C4H6O2. Chemical Test Observations + or - Ninhydrin test no colored spots on filter paper iodoform test clear pale-yellow solution Br2/CH2Cl2 (dark) clear red-orange solution Molisch test turbid colorless solution Tollen’s Test clear, colorless solution
- What is the purpose of setting the spectrophotometer to zero absorbance using a blank solution?Two compounds have Rf values of 0.50 and 0.61, respectively. The solvent front on a plate is developed to 10 cm. How far apart in centimeters are the spots for the two compounds?Why is a blank used in the spectrophotometer before the actual pigment is tested?