Caffeine C8H10N4O2 is stimulant found in tea and coffee. A sample of the substance was dissolved in 45.0 g if chloroform CHCl3 to give 9.78x10^-2m solution. How many grams of caffeine were in the sample

The freezing point of benzene, C,Hg, is 5.500 °C at 1 atmosphere. Kf(benzene) = 5.12 °C/m In a laboratory experiment, students synthesized a new compound and found that when 13.39 grams of the compound were dissolved in 298.4 grams of benzene, the solution began to freeze at 4.703 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound? g/mol

A student dissolves 14. g of sucrose (C,,H,,0,1) in 450. mL of a solvent with a density of 0.85 g/mL. The student notices that the volume of the solvent 22 does not change when the sucrose dissolves in it. Calculate the molarity and molality of the student's solution. Round both of your answers to 2 significant digits. molarity = | x10 molality %3D Continue Submit O 2022 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center MacBook Air 20 888 DD F3 F4 F5 F6 F7 F8 34 00

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The boiling point of chloroform, CHCl3, is 61.700 °C at 1 atmosphere. K,(chloroform) = 3.67 °C/m In a laboratory experiment, students synthesized a new compound and found that when 14.21 grams of the compound were dissolved in 241.3 grams of chloroform, the solution began to boil at 62.449 °C. The compound was also found to be nonvolatile and a non-electrolyte. What is the molecular weight they determined for this compound ? g/mol

When 98.9 g of glycine (C₂H5NO₂) are dissolved in 900. g of a certain mystery liquid X, the freezing point of the solution is 4.7 °C lower than the freezing point of pure X. On the other hand, when 98.9 g of iron(III) nitrate = (Fe(NO3)3): are dissolved in the same mass of X, the freezing point of the solution is 5.4 °C lower than the freezing point of pure X. Calculate the van't Hoff factor for iron(III) nitrate in X. Be sure your answer has a unit symbol, if necessary, and round your answer to 2 significant digits. i= 0

The colligative molality of an unknown aqueous solution is 1.01 m. (For pure water at 20°C: Po = 17.5 torr, kf = 1.86°C/m, kb = 0.512°C/m.) (a) What is the vapor pressure of the solution at 20°C? (Assume the solute is non-volatile and the solution is ideal.)  torr(b) What is the boiling point of the solution?  °C(c) What is the freezing point of the solution?  °C