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Electrons are ejected from the metal surface with a velocity of 5.20 x 105 m/s. What is the threshold frequency of the metal?
Evaluate the vibrational partition function for NH3 at 1000 K for which the vibrationalfrequencies are 950, 1627.5 (doubly degenerate), 3335, and 3414 cm-1.
An 11.0-g of NaCl is dissolved in 125 g of water, with both substance at 25.0'C. calculate the final temperature of the solution assuming no heat lost to the surrounding and assuming the solution ha
The membrane lipids from 4.74 × 109 erythrocytes form a monolayer of area 0.89 m2. What do these data indicate about the structural motif characterizing the lipid components in the membrane?
A piece of metal of mass 22 g at 92 C is placed in a calorimeter containing 53.7 g of water at 21 C. The final temperature of the mixture is 55.3 C. What is the specific heat capacity of the metal?
One mole of an ideal gas is sealed in a 22.4-rm L container at a pressure of 1.00 rm atm and a temperature of 273 rm K. The temperature is then increased to 305 rm K, but the container does not expa
In an experiment, 5.00 L of N2 is saturated with water vapor at 22°C and then compressed to half its volume at constant T.
A student adds 6.90 of a 0.380 solution to the beaker. How much will the pH change? The of acetic acid is 4.760.
A buffer is prepared by mixing mL of .452 M HCl and .500 L of .400 M sodium acetatae. How many grams of KOH must be added to .500 L of the buffer to change the pH by .175 units.
An insulated container holding 4.50 of water at 6.0. Assuming that no heat is lost to the surroundings, what will be the final temperature of the mixture?
when 0.800 grams of NaOH is dissolved in 100.0 grams of water, the temperature of the solution increases from 25.00 degree to 27.06 degree . what is the amount of heat absorbed by the water . ( the
A salt bridge connects the two beakers, and wires to a voltmeter link the two metal electrodes. Write the equation for the overall cell reaction.
At 20 degrees C, the vapor pressure of ethanol is 45 torr and the vapor pressure of methanol is 92 torr. What is the vapor pressure at 20 degrees C of a solution by mixing 27.0 g of methanol and 75.
What is the pressure in a gas container that is connected to an open end u tube manometer if the pressure of the atmosphere is 742 torr a
Given that the ph for acetic acid is 2.41, the ka=1.8X10-5 and assuming the density of vinegar to be 1.00g/cm3, what is the percent dissociation for acetic acid in vinegar?
What is the freezing point of a solution made by dissolving 352g of ethylene glycol c2h6o2 on 648g of water the freezing point of pure water is 0.0c and kf of pure water is -1.86Cm?
If oxygen gas were collected over water at 295K and the total pressure of the wet gas were 710 mm Hg, what would be the partial pressure of the oxygen?
A 1.630 g sample of naphthalene, C10H8(s), is completely burned in a bomb calorimeter assembly and a temperature increase of 8.44°C is noted.
Hydrocortisone valerate is an ingredient in hydrocortisone cream, prescribed for skin problems. Its empirical formula is C26H38O6. What is the percent by mass of carbon in hydrocortisone valerate?
Calculate the percentage of alcohol in the patient's body. Identify the substance produced in the liver that helps catalyze this reaction.
A solution is prepared by dissolving 14.4 g ammonium sulfate in enough water to make 100.0 mL of stock solution. A 11.50 mL sample of this stock solution is added to 55.00 mL of water. Calculate the
The specific heat of liquid water is 4.18 J/mol K. The molar heat of vaporization is 40.6 kJ/mol. The resulting sample contains which of the following?
A compound composed of sulfur and fluorine is found to contain 25.24% by mass of sulfur. If the molar mass of the compound is 254.11 g/mol, what is its molecular formula?
Compare the molar solubility of AgOH in pure water, with that in a solution buffered at pH 7.00. Note the difference between the two cases.
An Ice cube tray holds 325 grams of water. If the water initially has a temperature of 25 C, how many kilojoules of heat must be removed to cool and freeze the water 0 C?