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Density of the solution is 1.05 g/mol. What is its molarity of the solution? molailty of the solution? and mass percent of the solution?
Question: Substances A and B are the same mass and at the same initial temperature. When they are heated, the final temperature of A is 55 degree C higher than the temperature of B. What does this
Calcium carbonate, or limestone, is relatively insoluble in water. At 25?C, only 5.8 mg will dissolve in 1.0 liter of water. What volume of water is needed to dissolve 5.0 g of calcium carbonate?
Graphite and Diamond are both made from carbon atoms. List some of the physical characteristics of each.
Why is it not possible to convert bromobenzene to benzoic acid by the nitrile method and how could this conversion be accomplished?
The same mass of solute is dissolved in 9.82 g of t-butanol instead of cyclohexane. What is the expected freezing pt. change of this solution?
Silver has two stable isotopes with masses of 106.90509 amu and 108.9047 amu. The average molar mass of silver is 107.868 amu. What is the percent abundance of each isotope?
Name a metal that could be used in a future experiment to extract the copper from the copper (II) nitrate solution.
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