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The formula and the molecular weight of an inknown hydrocarbon compund are to be determined by element analysis and the freezing-point depressing method.
A) the hydrocarbon is found to contain 94.78 percent carbon anf 5.22 percwnt hydrogen. CALCULATE the empirical formula of the unknown hydrocarbon.
B) A solution is prepared by dissolving 2.53 grams of p-dichlorobenzene (molar mass 147 g/mol) in 25.86 grams of naphthalene (molar mass 128.2 g/mol). CALCULATE the molality of the p-dichlorobenzene solution.
C) The freezing point of pure naphthalene is determined to be 80.2 Degree Celsius. The solution prepared in (b) is found to have an initial freezing point of 75.7 Degree Celsius. Calculate the lolal freezing-point depression constant of naphthalene.
D) A solution of 2.40 grams of the unknown hydrocarbon dissolved in 26.7 grams of naphthalene is found to freeze initialy at 76.2 Degree Celsius. Caluculate the apparent milar mass of the unknown hydrocarbon on the basis of the freezing-point depression experiment above.
E) WHAT is the molecular formula of the unknown hydrocarbon?
Determine why the 2s and 2p orbitals on Hydrogen are degenerate and they are not in the case of Lithium and calculate Kp at 5 degrees and enter your answer in scientific notation if delta H rxn= -128 kj/mol CH 3 OH,?
The wavelength of maximum absorbance is solvent dependent. in water, the wavelength of maximum absorbance is 453 nm.
The atmospheric pressure at the summit of mount mckinley is 575 mmHg on a certain day. What is the pressure in atmospheres and in kilopascals?
A solution is prepared by adding 60.0 mL of 0.060 M HBr to 180.0 mL of 0.70 M HI. Calculate the concentrations of all species in this solution. HBr and HI are both considered strong acids
Balance the following equation in basic solution. indicate which reactant becomes oxidized during the reaction, which reactant becomes reduced
Ethanol and gasoline are both automobile fuels. If gasoline is selling for $4.50, what would the price of ethanol have to be in order to provide the same amount of heat per dollar.
Granite rock has a specific heat capacity of 0.80 J·°C-1·g-1. A 15 g rock was warmed by 202 J of energy from sunlight. What was the increase in temperature of the rock (in °C)?
NaCl(aq) + H2O(l) → NaOH(aq) + Cl2(g) + H2(g). If the brine contains 389 g of NaCl, how much Cl2 can be produced.
A 486 mL sample of water was cooled from 50.0°C to 10.0°C. Assuming a specific heat of 4.184 J/K g and a density of 1.00 g/mL, find the amount of heat transferred from the water to the surroundings.
What is the mass of aluminum metal that reacts to give 1 g of hydrogen gas?
What is the theoretical yield of bismuth when 393 g of Bi2O3 reacts with excess carbon as shown below? Bi2O3 + C(s) => Bi(s) + CO(g) (not balanced)
Disulfur dichloride is produced by reacting chlorine gas with molten sulfur. What is the percent yield if 3.25 g S2Cl2 is isolated from the reaction of 5.0 g S8 and 3.75 g Cl2
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