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If the total pressure in the flasks is 306 torr after the stopcock is opened, determine the intial pressure of N2 in the 1.00 L flask?
What must be added to 5/14 of 7/35 to make the sum equal to 7/3 of 1/21 ? Please solve it without using "x factor ".
What are the molecular (formula) masses of the following substances? Express your answer using one decimal place.
The activation energy for the reaction O + O3 ? 2O2 is 25 kJ/mol, and the enthalpy change is ?H = -388 kJ/mol. What is the activation energy for the decomposition of O2 by the reverse reaction
An experiment shows that a 249 -mL gas sample has a mass of 0.433 g at a pressure of 750 mm Hg and a temperature of 29?. What is the molar mass of the gas?
If all the energy obtained from burning 1.28 pounds of butane(fuel value is 10.85Kcal/g) is used to heat 123.0kg of water at an initial temperature of 18.7 C, what is the final temperature?
Calculate the concentration (M) of sodium ions in a solution made by diluting 70.0 mL of a 0.274 M solution of sodium sulfide to a total volume of 400 mL.
What is the molar concentration of a solution of sulfuric acid, H2SO4, if 9.11 mL react completely with 0.254 g of NaOH which was dissolved in 200 mL of water?
Exactly 18.9 mL of water at 26.0 C are added to a hot iron skillet. All of the water is converted into steam at 100C. The mass of the iron skillet is 1.35kg and the molar heat capacity of iron is 2
A few minuteslater, after traveling 100 feet east, the angle of depression tothe same landmark is determined to be 61°. Use this information to determine the height of the balloon.
A gas mixture contains 1.29 g N2 and 0.93 g O2 in a 1.49- L container at 23?. Calculate the mole fraction of N2.
Question: "Sam" and "Martha" are local names for two lighthouses. Sam blinks every 12 seconds, Martha every 8 seconds. They blink together at midnight. How many seconds will pass before they blink t
Calculate the deBroglie wavelength of a 1000 kg automobile traveling at 100 km per hour. Calculate the deBroglie wavelength of an electron traveling at 1% of the speed of light.
What is the partial pressure of argon, P_Ar, in the flask? What is the partial pressure of ethane, P_ethane, in the flask?
The temperature of a 22.0 g sample of material increases from 190.0 degree C to 42.0 degree C when it absorbs 5.00 kJ of energy as heat. What is the specific heat of this material?
A recipe that makes 6 servings calls for 1/3 cup of orange juice and 1/2 cup of lemonade. Arlene modifies the recipe so that it can serve 9. How many cups of orange juice does Arlene need?
The forensic technician at a crime scene has just prepared a luminol stock solution by adding 10.0 g of luminol to H2O creating a solution with a total volume of 75.0 mL. What is the molarity of t
Consider the decomposition of ammonium chloride at a certain temperature. Calculate the equilibrium constant KP if the total pressure is 2.8 atm at that temperature.
Calculate the equilibrium partial pressure of all the components, starting with pure phosgene at 0.760 atm. PCOCl2, PCO and PCl2.
Calculate the equilibrium concentration of HC2O4^- in a 0.20 M solution of oxalic acid.
A series RC circuit has a time constant of 0.960 s. The battery has an emf of 48.0 V, and the maximum current in the circuit is 0.500 mA. What are?
Determine a formula for the coefficient of kinetic friction between block and ramp.
Determine the number of calories and joules required to melt the ice given the following information: Initial water temperature= 51oC. Initial Volume of water = 25ml.
At room temperature what is the strength of the electric field in a 12-gauge copper wire (diameter 2.05 mm) that is needed to cause a 2.75-A current to flow?
Zinc reacts with hydrochloric acid according to the following balanced chemical equation: