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State the order with respect to each reactant and the overall order of the reaction for the following rate expressions:
Gallium has an average atomic mass of 69.7 amu. In a typical sample, 60.4% of Ga exists as Ga-69 (68.9257 amu). What is the identity and the atomic mass of the other isotope?
Calculate the final temperature (once the ice has melted) of a mixture made up initially of 75.0 ml liquid water at 29.0 degrees C and 7.0 g ice at 0.0 degrees C.
In what type of material is the energy gap between the valence and the conduction band the greatest? Na, Ge or diamond. Draw a rough energy band showing the valence and conduction bands in these mat
You have a kanamycin stock of 100mgs/ml. How much Kan do you need to add to the 1 liter of LB culture to have a concentration of 30micrograms/ml?
Calculate the work done (in J) on the surrounding atmosphere (1atm pressure, 25.8 oC) by the evolution of hydrogen in the subsequent reaction. State any assumptions you have made?
Calculate the mass of C2H6O2 that must be added to 1.00 kg of ethanol, C2H5OH,to reduce its vapor pressure by 13.2 torr at 35 degree celsius. The vapor pressure of pure ethanol at 35 degree celsius
We can calculate Kb for the carbonate ion if we know the Ka values of carbonic acid(H2CO3). Is Ka1 or Ka2 of carbonic acid used to calculate Kb for the carbonate ion? Explain.
When 5mls of 0.05M CH3COOH is allowed to react with 1.5mls of 0.05M KOH. The pH is found to be 4.43.Using the Henderson-Hasselback equation, calculate the pKa and thus the Ka of ethanoic acid.
Saturated water vapor at 200C is isothermally condensed to a saturated liquid in a piston-cylinder device. Calculate the work done during this process, in kJ/kg.
A voltaic cell is constructed that uses the following reaction and operates at 298 K.
Write an equation to represent the dissociation of Na2SO4 into ions in an aqueous solution. 5.3 grams of Na2SO4 are dissolved and diluted up to 350 ml.
When a non-volatile solute is added, the vapor pressure of acetone above the solution falls to 232 torr. What is the mole fraction of acetone in solution?
The molar heat capacity of a gas at constant pressure is 18.7J mol-1 K-1. What is the heat capacity of 9.4 moles of this gas at constant volume?
If 1.00 moles of H2 and 2.00 moles of I2 are introduced into a 3.00 L flask at 500 degrees Celsius, how many moles of HI are present at equilibrium?
A 1.5 gram sample of a gaseous hydrocarbon has a volume of 820 ml when measured at 227 degrees Celcius and 2.50 atm. Which of the following is the formulas for the gas?
Question: 3 grams of propane burns and warms 100 grams of water from 20 degrees Celsius to 100 degrees Celsius. What is the delta H of combustion of the propane. What is the sign (positive or negati
The freezing-point depression of a 0.100 m (molality) MgSO4 solution is 0.225 degrees Celsius. Determine the experimental van't Hoff factor of MgSO4 at this concentration.
It takes 46.0 J to raise the temperature of an 12.5g piece of unknown substance from 13.0 oC to 26.2 oC. What is the specific heat for the substance?
At 20°C only 0.24 g of an organic acid "A" dissolves in 100. mL of water, but 2.70 g of the same acid dissolves in 100. mL of ether. Calculate the value of the partition coefficient.
When 1.00 gram of reserpine is dissolved in 25.0 grams of camphor, the freezing point depression is 26.3 degrees C. Calculate the molality of the solution and the molar mass of reserpentine.
What is the mass of hydrogen gas released from 2.70 g of aluminum metal and hydrochloric acid?
Calculate the amount of Tris (hydroxlmethyl) aminomethane (Tris) necessary to make 100mL of a 0.100M Tris buffer that is equimolar in Tris-base(MW=121.1 g/mol) and Tris-HCl(MW=157.6g/mol).
0.25 mols of an unknown acid is dissolved in enough water to make 1 Liter of solution. The pH of the solution is 2.19. Determine the ka of the acid from this data.
Lindane is a toxic insecticide that causes dizziness and diarrhea in humans. Find the molecular formula for lindane given its percent composition: 24.78% C, 2.08% H, and 73.14% Cl. The approximate m