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Which solution would create the higher osmotic pressure (compared to pure water)- one prepared from 1.0g of NaCl in 10 mL of water or 1.0g of CsBr in 10 mL of water?
A 0.115 M solution of an unknown weak acid (HA) has a pH of 2.57. I determined the acid ionization constant (Ka) for the acid to be: Ka = 2.53 X 10-6. What is the weak acid and what is
A sample of gas changes from P1,V1 and T1 to P2,V2 and T2 by one path and then back to P1,V1 and T1 by another path.Which of following must be zero for the gas in this cycle? ΔT,ΔP
If the initial concentration of N2 was 0.500 M and the concentration of N2 was 0.450 after 0.100 sec, what is the rate of the reaction?
Calculate the heat released when 2.58 L of Cl2(g) with a density of 1.88 g/L reacts with an excess of sodium metal at 25°C and 1 atm to form sodium chloride.
For a hydrogen atom with its electron in the 3p_z orbital, what is the longest wavelength of light that can ionize the atom?
Calculated the change in entropy of the copper taking C=24.4j/kmol. The experiment is then repeated with the copper immersed in a stream of water that maintains its temp at 293. Calculate the change
If 3.35 mL of vinegar needs 44.0 mL of 0.135 M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in a 1.50 qt sample of this vinegar?
In the lab you determine the molarity of KMnO4 to be 0.08611 M for your first titration and 0.08837 M for your second titration. What is the relative precision for these two trials?
How does the Hammond postulate explain: a. the greater selectivity for bromination vs. chlorination of an alkane?
A 65.0 g sample of zinc (specific heat = 0.0922 cal/g X deg C) was cooled from 100.0 deg. C to 29.4 deg. C in a calorimeter cup containing water initially at 21.5 deg. C. What is the mas of the wat
Calculate the quantity of heat in kJ, associated with a 33.5 degrees Celsius in temperature in a 5.85kg aluminum bar ( specific heat of aluminum= 0.903 J g-1 C-1 )? Please show all work.
The higher heating value (HHV) of a fuel is its standard heat of combustion at 25 C with liquid water as a product; the lower heating value (LHV) is for water vapor as product.
Describe how a linear sequence of amino acids gives rise to the three-dimensional structure of proteins. Detail the significance of this structure, how it may be modified, and the results of such mo
Initially a mixture contains 0.760 mol each of N2 and O2 in an 8.26-L vessel. Find the composition of the mixture when equilibrium is reached at 3900°C. For the reaction below, the Kc = 0.0123 a
The reaction A + 2B products was found to have the rate law, rate = k[A][B]2. Predict by what factor the rate of reaction will increase when the concentration of A is doubled and the concentration o
What is the preferred slip plane and direction for dislocation in FCC metal? Explain using the Peierls-Nabarro expression described in class.
An aqueous solution of phosphoric acid, H3PO4, contains 285g H3PO4 in 400 mL solution, and has a density of 1.35g/mL. Calculate the weight % H3PO4 in this solution
Suppose that a particular moment during the reaction, molecular hydrogen is reacting at the rate of -0.079M/s a) at what rate is ammonia being formed? b) at what rate is molecular nitrogen reacting?
Qualitative analysis of cations, Chromium (III) hydroxide is highly soluble in distilled water but dissolves readily in either acidic or basic solution. Briefly explain why the compound can dissolve i
Consider a solution containing liquids A and B where the mole fraction of B is .60. Assuming ideality, calculate the mole fractions of A and B in the vapor at equilibrium with this solution @25.
If the concentration of an acid in solution is 2.2 times larger than the concentration of its conjugate base, and the pH of the solution is 3.5, what is the pKa of the acid?
How many Joules are required to heat 2 L of water in a pot from 20 degree C to the boiling point of water? The specific heat of water is 4.18 J/g.Degree C and the density of water is 1 g/mL
The solubility of CO2 in water at 25 degree Celsius and 1 atm is 0.034 mol/L. What is its solubility at a partial pressure in air of 0.00013 atm? Assume that CO2 obeys Henrys Law.
The molar enthalpy of vaporization of propane is 15.7 kJ/mol. At 1.00 atm pressure, propane boils at 231.1 K. At what temperature is the equilibrium vapor pressure of propane equal to 0.50 atm?