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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?
If 69.5 kJ of heat is applied to a 1039 g block of metal, the temperature of the metal increases by 11.4°C. Calculate the specific heat capacity of the metal in J/g°C.
Write the balanced equation for the complete combustion of each of the following compounds
50.50 mL of 0.116 M HF is titrated with 0.1200 M NaOH. How many mL of the base are required to reach the equivalence point? (Ka for HF is 6.8 x 10-4)
If 2.0x10^-4 moles of S2O8. In 100 ml solutions is consumed in 120 seconds what is the rate law
A 27.2 mL sample of a solution of RbOH is neutralized by 16.12 mL of a 2.047 M solution of HBr. What is the molarity of the RbOH solution? Answer in units of M.
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Acetylene gas (C2H2) used in welding, produces an extremely hot ?ame when it burns in pure oxygen according to the reaction 2 C2H2(g)+5 O2(g) -→ 4 CO2(g)+2 H2O(g)
A can of mineral water contains 345 mL of water. How many molecules of water does the can contain? (water = 1.00 g/mL)
Calculate the work done (in Joules) when 33.3g of tin dissolves in excess acid at 1.04 atm and 22 degrees C. Assume ideal gas behavior.
Calculate the number of kilograms of helium required to inflate a balloon with a volume of 100.000 L at a pression of 250 mmHg and atmospheric temperature of -35 ° C.
A mixture of nitrogen and liquid ethanol in a closed constant-volume container has a partial pressure of 101 mm Hg of nitrogen and 66.2 mmHg ethanol at 27 C (300 K)
The Haber process is very important for agriculture because it converts N2 (g) from the atmosphere into bound nitrogen which can be taken up and used by plants. The reaction is N2 + H2->NH3
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