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the enthalpy fusion of methanol is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol?
43 kg person drinks 410. g of milk, which has a "caloric" value of approximately 3.0 kJ/g. If only 18% of the energy in milk is converted to mechanical work.
How long does it take to deposit a coating of gold 1.00um thick on a disk-shaped medallion 4.00 cm in diameter and 2.00 mm thick at constant current
What mass of solid sodium formate (of MW 68.01) must be added to 140 mL of 0.3 mol/L formic acid (HCOOH) to make a buffer solution having a pH of 3.77? Ka = 0.00018 for HCOOH.
Determine the solubility of N2 in water exposed to air at 25 C if the atmospheric pressure is 1.2 atm. Assume that the mole fraction of nitrogen is 0.78 in air and the Henry's law constant for nitrogen in water at this temperature is 6.1 10-4 M/at..
The Ka of acetic acid is 1.85 x 10-5. What would be the pH of a buffer prepared by mixing 50.0 mL of 1.0 M potassium acetate with 50.0 mL of 1.0 M acetic acid?
Describe the preparation of 1.5 liters of a 0.1 M acetate buffer, pH 5.0, starting from solid sodium acetate trihydrate
whose temperature is 95 C and which contains 130g of liquid. Assume the specific heat capacity of the coffee is the same as that of water. The heat of fusion of ice
Gaseous HBr has an absorption band centered at about 2645 cm-1 consisting of a series of lines approximately equally spaced with an interval of 16.9cm-1.
A certain second-order reaction (B--> products) has a rate constant of 1.40×10^-3 M^-1*s^-1 at 27 Celsius and an initial half-life of 280s . What is the concentration of the reactant B after one half-life?
Draw the products(if any) expected from the treatment of each of the following compounds with ozone followed by aqueous hydrogen peroxide
The nitration of toluene gives o- and p-nitrotoluene as the major products
Determine How hot should be the air in a ballon be heated if it has initially a volume of 750. L at the temperature of 20 degree celsius and the final volume must be 1,000.l
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