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The mixture freezes at 62.7 degrees celcius. The freezing point of pure stearic acid is 69.4 degrees celcius. What is the freeezing point constant of stearic acid?
For a particular reaction, ΔH° is 20.1 kJ and ?S is 45.9 J/K. Assuming these values change very little with temperature, over what temperature range is the reaction spontaneous in the forw
Determine the limiting reagent when 50.00mL of 0.0100M potassium iodate is treated with 1.00 g of potassium iodide and 10.00ml of 3 M hydrochloric acid.
Only one of each of the following pairs of reactants undergoes a reaction. Complete and balance the equation for the reaction that occurs.
Question: Suppose that 450.9 J of heat energy is required to completely vaporize 3.1 g of a pure liquid. If the molar mass of the liquid is 54.05 g/mol, what is the molar enthalpy of vaporization of
30 g of steam at 100EC condenses and drops to a temperature of 70EC. How much energy is needed to cool the liquid water at 100EC to the final temperature of 70EC?
After swimming in a pool or lake, the air feels cool because heat is required to evaporate the water from our skin. How much heat is required to evaporate 20.3 g of water? The enthalpy of vaporizati
Nickel has a face-centered unit cell with all atoms at lattice points and an edge length of 352.4 pm. The density of metallic nickel is 8.91 g/cm3. What is the mass of a nickel atom?
100.0 mL solution that was made by adding 10.26 grams of sucrose (C12H22O11) to 95.0 mL of pure water (density of pure water is 1.00g/mL). Calculate the osmotic pressure exerted by the sucrose solut
If the rate constant for this reaction was determined to be 5.0 x 10-3 M-1s-1 at 220C and 7.5 x 10-3 M-1s-1 at 350C what is the activation energy?
100.0 mL solution that was made by adding 10.26 grams of sucrose (C12H22O11) to 95.0 mL of pure water (density of pure water is 1.00g/mL). What is the molality of the sucrose solution?
Calculate the entropy of a sample of a solid in which the molecules may be found in any one of four orientations with the same energy. Suppose there are 27 molecules in the sample.
A student purified a 500-mg sample of phthalic acid by recrystallization from water. The published solubility of phthalic acid in 100mL of water is 0.54 g at 14C and 18 g at 99C.
Two vessels are labeled A and B. Vessel A contains NH3 gas at 75 degrees celsius, and vessel B contains Neon gas at the same temperate. if the average kinetic energy of NH3 is 7.1 x 10 exp -21 J/molec
A mixture of ideal gases having a total mass of 14.1 g is placed in a 13 L vessel at 251.0 K. The equilibrium pressure is measured to be 1.9 bar. Calculate the average molar mass of the gas mixture.
Write the chemical mechanism that explains the formation of products from the dehydration of 2-methylcyclohexanol, under the action of a strong acid.
Aluminum has a face-centered cubic lattice with all atoms at lattice points and a unit-cell edge length of 405.0 pm. Its atomic weight is 26.9 amu. What is the density of aluminum?
The concentration of Fe3+ ion at the beginning of an experiment was 0.03540 M. After 4.00 min, it was 0.02641 M. What is the average rate of reaction of FeCl3 in this time interval? __ M/min
If an ideal gas initially at 1.2 bar and 1.5 L is compressed at constant temperature to a volume of 0.6 L, what is the final pressure of the compressed gas?
Typically, scuba tanks are immersed in water to cool them as they are filled with compressed air. If a tank is initially charged to 3000.0 psi at 37 C and subsequently allowed to cool to 24 C, what
Titanium dioxide (TiO2) is prepared by reaction of TiCl4 with O2 at high temperature. How many kilograms of TiO2 can be prepared from 5.65kg of TiCl4?
Provide a series of synthetic steps including reagents and intermediates by which (CH3)2C=CH2 could be prepared from 2-methylpropane. (hint: 2 steps-free radical halogenation and dehydrohalgenation
Why is it difficult to use refractive index to determine the concentration of alcohol above 56% by weight?
Why is it problematic to write a rate law for the decomposition of H2O2 with MnO2 as a catalyst (assume the reaction is first-order in peroxide and manganese dioxide.)
A sample of Zn(s) is reacted with HCl(aq) to form hydrogen gas. The H2 gas bubbles out of aqueous solution and is collected in a 550.0 mL container at 645.6 Torr and 25 C. How many grams of zinc rea