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An ideal gas is contained in a cylinder with a volume of 5.0 102 mL at a temperature of 30°C and a pressure of 720. torr. The gas is then compressed to a volume of 25 mL, and the temperature is ra
A balloon is filled with helium to a volume of 25 L at 100kPa pressure and 25°C. The balloon is then released. What volume does it occupy when it has reached an altitude where the pressure is 18 k
A high-boiling, bp = 202-204 degrees C, burns with a yellow, sooty flame. Sodium fusion indicated that halogens, nitrogen and sulfur are not present. It is not soluble in water, dilute sodium bicarbon
A 0.21L sample of hydrogen gas is collected over water. The reaction that allowed the gas to be liberated was between Mg ribbon and 3M HCl. If the starting conditions were at STP with 0.58g of Mg and
An aqueous solution has a vapor pressure of 84.0 at 50 . The vapor pressure of pure water at this temperature is 92.6 . What is the concentration of in mass percent?
Water's relatively high specific heat (4.184 J/g°C) makes it an ideal coolant for automobile engines. How much heat from an engine would be absorbed if 13.9 kg of cooling system water were heated
The total pressure in the system at equilibrium is 3.0 atm. A separate measurement shows that the mole fraction of O2 at equilibrium is 0.12. (a) Write the Kp expression for this reaction.
Calculate the moles of aluminum ions present in 250.0 g aluminum oxide. Acetaminophen, a common aspirin substitute, has the formula C8H9NO2.
How many liters of h2 gas at stp can be produced by the reaction of 4.60g of Na and excess water, accoring to the following equation?2Na(s) + 2H2O(l) ---> H2(g)+2NaOH(aq)
A student was asked to identify an unknown hydrate by following the procedure described in this module. After heating and cooling, a 2.752-g sample of this unknown weighed 1.941 g.
A stock solution is prepared by adding 28 mL of 0.2 M Na3PO4 to enough water to make 76 mL. What is the PO43- concentration of 55 mL of the stock solution?
Calculate the number of grams of isopropyl alcohol (rubbing alcohol), C3H8O, which must be added to 275 g of water to prepare a 2.00 m solution of isopropyl alcohol.
A sample of nitrogen gas is collected over water at a temperature of 20 degrees celcius and a pressure of 1.00 atm. the volume of the collected gas is 250.0 L. what is the mass of N2 collected? (at
If 83.7 grams of aluminum, Al, and 195.2 grams of sulfur, S, are put into a container and allowed to react according to the above equation, which substance(s) and how many grams of each would be prese
Write an expression for the reaction rate law.
What percentage of the water will be vapor when the system reaches equilibrium?assume ideal behavior of water vapor and that the volume of liquid water is negligible. the vapor pressure of water at
Platinum crystallizes with a face-centered cubic unit cell. The radius of a platinum atom is 139 pm. Calculate the density of platinum.
Charles flew the balloon for fifteen miles and stayed in the air for a total flight time of 45 mins. the balloon was made of silk coated with a thin layer of natural rubber and had a diameter of 27ft.
Write the equation for the heat of formation of C2H6(g). Calculate the change in enthalpy if 25.0 g of acetylene reacts with 15.0 g of hydrogen
The pressure exerted on a 240 ml sample of hydrogen gas at constant temperature is increased from .428 atm to .724 atm. What will the final volume of the sample be?
Determine the final value of n in a hydrogen atom transmition, if the electron starts in n=2 and the atom absorbs a photon of light with a frequency of 4.75x10^14 Hz
A helium-filled balloon has a volume of 2.75 L at 17 C. The volume of the balloon decreases to 2.36 L after it is placed outside on a cold day. What is the outside temperature in K?
Acetylacetone (acac) forms a trisacetylacetonateiron (III) complex (i.e., Fe(acac)3) in aqueous solution. A 5 mL aliquot of acetylacetone stock solution is diluted to 200mL with an iron (III) chloride
oxygen gas is collected over water at 21 degrees C and an atmosperic pressure of 748 mm Hg. What is the partial pressure of oxygen gas in the mixture.
8.5 g of steam at 373 K is added to 305 g of H20 (l) at 310 K at constant pressure of 1 bar. Is the final state of the system steam or liquid water? Calculate delta S for the process.