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What is the conjugate base of hydrazoic acid? For any general weak acid, HA, HA(aq) + H2O(l) H3O+(aq)+ A-(aq) and Ka = a) What is the conjugate base of HA?
Suppose that 26 g of each of the following substances is initially at 29.0degrees C. What is the final temperature of each of the following substances upon absorbing 2.35 kJ of heat?
Use Planck"s constant (h = 6.6260755 x 10-34 J-s) to determine the Energy or frequency for electromagnetic waves: E = h. Describe the photoelectric effect.
A solution of 4.93 g of a carbohydrate in 100.0 g of water has a density of 1.017 g/mL and an osmotic pressure of 3.36 atm at 20.0 degrees C. Calculate the molar mass of the carbohydrate?
Which reactant is the limiting reagent and which is the excess reagent?
Draw three simple molecules that illustrate the geometry of each states.Define" reduction" with reference to organic reactions.
Methyl alcohol (CH3OH) is made by reacting carbon monoxide with H2. Starting with 2.5 g of H2 and 30 L of CO, what mass of methyl alcohol could be produced at STP? which is the limiting reactant?
The molecular weight of citric acid is 0.030M. How many grams of citric acid (molecular weight = 192) are present in a 120ml serving assuming its density is the same as that of water?
A 4.22g sample of CuS was added to excess HCl, and the resulting H2S was collected over water. What volume of H2S was collected at 32 degrees celsius when the atmospheric pressure was 749 torr (1at
An iron bar of mass 869 - g cools from 90 oC to 5 oC > Calculate the heat released (in kilojoules) by the metal. ( specific heat = 0.44 J/(g. c)
What percent of each reactant will remain at equilibrium? What is the free energy change for the reaction after 10% of the reactants have been converted to products?
A piece of copper wire is 25 feet long and has a diameter of 2.0mm. Copper has a density of 8.92g/cm^3. (a) how many mols of copper are there in this wire?
Based on mole ratios. A sample is 59.53% C, 5.38%H, 10.68%N, and 24.40%O what is its empirical formula. A 0.2000 gram sample of a compound (vitamin C) composed of only C, H, and O is burned completely
How many kilojoules are needed to raise the temperature of 325 g of water from 15.0C to 77.0C? How many kilojoules are needed to raise the temperature of 325 g of water from 15.5C to 77.5C?
An automobile gasoline tank holds 21kg of gasoline,when the gasoline burns, 84kg of oxygen is consumed, and carbon dioxide and water is produced. What is the total combined mass of carbon dioxide an
Calculate the amount of N2 gas released (in liters at 37 degrees celsius 1 atm) when the diver returns to the surface of the water, where the partial pressure of N2 is 0.8 atm.
If a reaction mixture contains only N2O and NO2 at partial pressures of 1.0 atm each, the reaction will be spontaneous until some NO forms in the mixture. What maximum partial pressure of NO builds
What is the largest alkane (number of carbons) that can be named not exceeding "decane" as a parent? Where is the primary How many What family. I.e. what Where and what carbons? Is the primary functio
Use the reaction shown to calculate the mass of solid ammonium nitrate that must be used to obtain 0.200 L of dinitrogen oxide gas at STP.
The most common source of copper (rm Cu) is the mineral chalcopyrite (rm CuFeS_2). How many kilograms of chalcopyrite must be mined to obtain 200. g of pure rm Cu?
When 1.2563 g of an organic iron compound containing, Fe, C, H and O was burned in O2, 2.2398 g of CO2 and 0.67249 g of H2O were produced. What is the mass percent of hydrogen in the compound?
A zero-order reaction has a constant rate of 4.00×10-4 . If after 40.0 seconds the concentration has dropped to 9.00×10-2 , what was the initial concentration?
What would happen to the pressure inside the container if you decrease the temperature to one fourth the original temperature while holding the volume and number of moles constant?
A scientist wishes to compress 50.0 ml of ammonia gas at normal atmospheric pressure to a volume of 1.0 ml. What pressure in atmospheres is necessary?
If, in a certain experiment, over a specific time period, 0.0027 mol PH3 is consumed in a 1.8-L container each second of reaction, what are the rates of production of P4 and H2 in this experiment?