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Microwave ovens use microwave radiation to heat food. How many photons are required to heat 200. mL of coffee from 19°C to 64°C?
Electrolysis of molten NaCl in a Downs cell is the major isolation step in the production of sodium metal. Suppose 250. g of Na metal is formed. How many coulombs are required?
Strawberries contain about 15 wt% solids and 85 wt% water. To make strawberry jam, crushed strawberries and sugar are mixed in a 45:55 mass ratio, and the mixture is heated to evaporate water until
Calculate the amount of heat released when 50g of steam at 100 degrees celsius hits the skin, condenses, and cools to a body temp of 37 degrees celsius.
if 100 mL of 0.100 M NaCl is added to 100 mL of .01 M NaCl, what is the concentration of Na ions in the final solution?"
If the activation energy is 210 Kj/mol, calculate the arrhenius preexpnential factor and determine the rate constant at 600 K.
If I have 7.0 moles of gas at a pressure of 0.10 atm and at a temperature of 50.1 degrees C in a balloon, what is the volume of the balloon? (Round to one decimal place.)
24.6 ml volume of HCl solution reacts completely with a solid sample of magnesium carbonate, producing 183 ml of gaseous product (there is only one gaseous product from the reaction). The gaseous pr
You have 75.0 mL of a 2.50 M solution of Na2CrO4(aq). You also have 125 mL of a 1.52 M solution of AgNO3(aq). Calculate the concentration of CrO4 2- after the two solutions are mixed together.
Calculate the concentration of SO2 that must be reached in polluted air if the dissolved gas is to produce a pH of 4.0 in raindrops without any oxidation of the sulfur.
What is the free Zn2+ concentration if 0.020 M Zn2+ solution is mixed with an equal volume of 2.0 M NH3? Kf for [Zn(NH3)4]2+ is 4.1 × 10^8
The label of an aerosol spray can contains a warning that the can should not be heated to over 130 degrees F because of the danger of explosion due to the pressure increase as it is heated. Calcula
Determine the molar heat capacity of aluminum chloride in the sample. The C value for aluminum chloride is 92 J/mol*K.
Pure nitrogen can be prepared when an aqueous solution of ammonium nitrite decomposes to form water vapor and nitrogen gas. How many grams of ammonium nitrate must have reacted if 3.75dm3 of nitroge
The pressure of a sample of gas at 10.0 C increases from 700. mm Hg to 900. mm Hg. What is the new temperature?
Vaporization of water into air in a wetted-wall column, the following data were obtained: Tube diameter= 1.46 cm, Wetted-tube length= 82.7 cm. Calculate the rate of mass transfer of water in air.
A 24.6 mL volume of HCl solution reacts completely with a solid sample of magnesium carbonate, producing 183 mL of gaseous product (there is only one gaseous product from the reaction). The gaseous
Calculate the volume of H2O(g) at 22.0 degrees Celsius and 745 mm Hg you use if you begin with 350g of CO(g)for the following reaction.
What is the pressure (in atmospheres) of the gas inside the container connected to an open-end, mercury-filled manometer as shown in the picture? The atmospheric pressure is 0.95 rm atm.
The hydrogen gas generated is collected over water at 25.0°C. The volume of the gas is 295 mL measured at 1.00 atm. Calculate the number of grams of sodium used in the reaction. (Vapor pressure
Tincture of iodine is I2(s) dissolved in ethanol, C2H5OH. How many grams of solvent are present in 1000. g of this solution?
If the ground temperature is 20?C, the lapse rate is zero, and the balloon is in hydrostatic equilibrium at a cruising altitude of 900 hPa, determine the temperature of the air inside the balloon.
It takes 55.0 to raise the temperature of an 11.7 piece of unknown metal from 13.0 to 24.0. What is the specific heat for the metal?
A 530. g piece of copper tubing is heated to 89.5°C and placed in an insulated vessel containing 159 g of water at 22.8°C. Assuming no loss of water and heat capacity for the vessel of 10.0
In the titration of 100.0 mL of 0.100 M methylamine, CH3NH2 (Kb = 3.7 * 10-4), with 0.250 M HCl, calculate the pH under the following conditions.