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A sealed balloon is filled with 1.40 L of helium at 23°C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 200. torr and the temperature is -26°C. What is th
A sample weighing 25g starts at 99 degrees celsius. It is put in a calorimeter containing 100g water. The water temperature begins at 20 degrees and both water and sample reach equilibrium at 32 degre
Calcium oxide, or lime, is produced by the thermal decomposition of limestone in the reaction CaCOmc062-1.jpg(s) mc062-2.jpg CaO(s) + COmc062-3.jpg(g).
Calculate the equilibrium constant KP if the total pressure is 2.6 atm at that temperature.
Name the principal enzymes taking part in this bioconversion. To which class of enzymes do they belong to?Is this biocatalytic process used in the manufacture of alcohlic beverages?
One liter of a solution of pH 9 has how many hydroxyl ions (OH-) than 1 L of a solution of pH 4?
A fixed quantity of gas at 21 exhibits a pressure of 730 and occupies a volume of 4.40. Use Boyle's law to calculate the volume the gas will occupy if the pressure is increased to 1.85 while the te
At a certain temperature and pressure 4.2 L of N2 reacts with 6.3 L of O2. If all the N2 and O2 are consumed, what volume of N2O3, at the same temperature and pressure, will be produced? (L)
A pressure of 0.600 atm of nitrosyl chloride is sealed in a flask and allowed to reach equilibrium. If 27.0% of the NOCl decomposes, what is the equilibrium constant for the reaction?
The calcium oxide is added to seawater, and a number of changes occur. First calcium oxide reacts with water to form calcium hydroxide. what is the word equation for this? and the balanced equation?
An ideal gas is in a cylinder with a volume of 250.0 mL at a temperature of 25 ºC and a pressure of 700 torr. The gas is expanded to a volume of 1.0 L and the temperature increased to 500 &ord
A graduated cylinder contains 18.5 {rm mL} of water. What is the new water level after 30.0 {rm g} of silver metal with a density of 10.5 {rm g/mL} is submerged in the water?
In a calorimeter, 10.0 g of ice melts at 0oC. The enthalpy of fusion of the ice is 334 J/g. How much heat was absorbed?
Calculate the standard emf of a cell that uses the Mg/Mg2+ and Cu/Cu2+ half cell reactions at 25 deg C. What is the equation for the cell reaction that occurs under standard-state conditions?
Determine the freezing point of a solution of 60.0g of glucose, C6H12O6, dissolved in 80.0g of water.
How many moles of water vapor would have to be added to the container to increase the concentration of H2 to 0.320 M when equilibrium is re-established?
Identify the two important classes of catalysts. Analyze the chemical reactions that take place when a biological catalyst combines with a reactant (substrate) to form an unstable intermediate.
What volume of H2s was collected at 32 C when the atmospheric pressure was 749 torr (1 atm=760 torr)? The vapor pressure of water at this temperature is 36 torr.
How many grams of methanol must be added to 7.50 kg of water to lower its freezing point to -13.0 degrees C? For each mole of solute, the freezing point of 1 kg of water is lowered 1.86 degrees Celsiu
1-bromobutane was added to a solution of sodium iodide in acetone. One of the possible side products of this reaction is dibutyl ether. Provide the mechanism of thus molecule.
For the reaction given below, the frequency factor A is 8.7 1012 s-1 and the activation energy is 63 kJ/mol. What is the rate constant for the reaction at 80°C?
How many calories are given to a household radiator when 1000 grams of 100C steam condences, and drops in temperature to 90C water?
A gas sample containing 1.56 mol at 25°C exerts a pressure of 394 torr. Some gas is added to the same container, and the temperature is increased to 50.°C. If the pressure increases to 800.
You need to make an aqueous solution of 0.180 M sodium sulfate for an experiment in lab, using a 250 mL volumetric flask. How much solid sodium sulfate should you add ?
Four ice cubes at exactly 0 degrees C having a total mass of 55.0 g are combined with 120 g of water at 76 degrees C in an insulated container. What is the final temperature of the mixture?