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An unknown gas sample was dissolved in water at 25°C, producing a solution with a concentration of 4.7 x 10-4 M at 522 mm Hg. What is the Henry's law constant for the unknown gas
The temperature of a lead fishing weight rises from 15 oC to 45 oC as it absorbs 22.5 kJ of heat. What is the mass of the fishing weight in grams? Heat capacity of lead is 0.128 J/g oC.
What is the volume of the gas in milliliters when the pressure and temperature of the gas sample are changed to 634 and 301 ?
No crystals form on cooling, and so the student pours out the solution and starts the experiment over. Have the carbon, hydrogen, nitrogen, and oxygen atoms of the acetaminophen been destroyed?
What is the numerical value for the equilibrium constant for this reaction:
What is numerical value of the equilibrium constant for the reverse reaction?
At 25 degrees Celsius the first-order rate constant for a reaction is 2.0x10^3 s^-1. the activation energy is 15.0 kJ/mol. what is the value of teh rate constant at 75 degrees Celsius?
What is the molarity of the OH- ions in 0.040 M barium hydroxide, Ba(OH)2? I know the answer is .08M. The barium hydroxide is fully dissociated into ions in the dilute solution.
What mass of magnesium, in reaction with hydrochloric acid, is needed to produce 128 mL of hydrogen (H2) gas? The H2 gas is collected over water at a temp. of 25 C.
In an equilibrium mixture of the three gases, the partial pressures of SO2Cl2 and SO2 are 3.31 atm and 1.59 atm, respectively. What is the partial pressure of Cl2 in the equilibrium mixture?
Calculate the amount of heat required to completely sublime 20.0 g of solid dry ice {rm{(CO}}_2 ) at its sublimation temperature. The heat of sublimation for carbon dioxide is 32.3 {{rm{kJ}}}/{{rm{m
What is the equilibrium partial pressure (in atm) of H2S if a solid sample of NH4HS is placed in a closed container and allowed to reach equilibrium at 295 K?
A substance has a specific heat capactiy of 2 J/g C. How many joules are needed to raise the temperature of 30 g of this substance by 15 C.
How many grams of water will you require? (B) If you produce 1.00 L of a .554 M solution of calcium hydroxide, how many grams of calcium phosphide did you start with?
A mixture of 1.374 g of H2 and 70.31 g of Br2 is heated in a 2.00-L flask at 700 K. The following equilibrium is established:
Which of the following obey the octet rule BeH2, CCl3, SeO2 (2-), PCl3, KrCl2, NO2? and if they do not obey the octet rule, what is the problem? are there too many valence electrons, or too few?
If 4.00 grams of water at an initial temperature of 1.00 degrees C absorbs 33.00 joules of heat, by how many degrees C does the water temperature change?
How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions of 0.800 M.
117 gram sample of a metal reacts with hyrdochloric acid to produce 36.3 ml of dry hydrogen gas, measured at stp. what is the equivalent weight of this metal?
Starting with only the solid, it is found that 40 degrees Celsius the total gas pressure (NH3 and CO2) is 0.363 atm. Calculate the partial pressure of NH3 and CO2.
A solution is prepared by dissolving 246 g of sucrose (C12H22O11) in 624 g of water. What is the vapor pressure of this solution at 30°C? (The vapor pressure of water is 31.8 mmHg at 30°C.)
Consider 54.5 mL of a solution of weak acid HA (Ka = 1.00 10-6), which has a pH of 3.700. What volume of water must be added to make the pH = 6.000?
Calculate the number of water molecules that can be prepared from 664 H2 molecules and 664 O2 molecules.
The solution has a vapor pressure of 262 . Pure pentane and hexane have vapor pressures of 425 and 151 , respectively, at room temperature. What is the mole fraction of hexane? (Assume ideal behavi
What mass of magnesium, in reaction with an excess of hydrochloric acid, is needed to produce 128 mL of hydrogen (H2) gas?