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An oxygen tank contains oxygen at a pressure of 70 kPa. When the pressure drops to 36 kPa, the temperature increases from 300 K to 350 K. If the initial volume is 9 L, what is the final volume?
Calculate the amount of heat needed to boil of ethanol (), beginning from a temperature of . Round your answer to significant digits. Also, be sure your answer contains a unit symbol.
If 1.56g of a gas has a volume of 1.00 L at .984 atm and 50 degrees Celcius, what is the molar mass of the compound.
Calculate the theoretical yield of aspirin from this week's experiment (i.e. calculate the grams of aspirin produced from 1.4 gram salicylic acid).
A patient needs to take 625 mg of ibuprofen twice daily. The pills in the bottle are each 250. rm mg. How many pills does the patient need to take each time she wants the 625 mg dosage? Assume that
A 345 mL container holds NH3 at a pressure of 745 torr and a temperature of 45 degrees Celsius. What is the molar concentration of ammonia in the container?
How many grams of methane must be combusted to heat 1.20g of water from 23.0C to 93.0C, assuming as a product and 100% efficiency in heat transfer?
15.0 ml sample of .1M Ba(OH)2 is titrated with .125 M HCl. Calculate the pH for atleast five different throughout the titration curve and make a sketch of the curve.
Write the overall equation for the production of nitric acid by the Ostwald process by combining the preceding and any other necessary equations.
Given that 24.0mL of 0.170 M sodium iodide reacts with 0.209M mercury(II) nitrate solution. what is the mass of HgI2 precipitate?
Bone was dissolved in hydrochloric acid, giving 50.0 mL of solution containing calcium chloride, CaCl2. To precipitate the calcium ion from the resulting solution, an excess of potassium oxalate was
Calculate the heat (in kJ) associated with the complete reaction of 155g of NH3.
The temperature of the mixture is 0 degrees C , and the total pressure is 1.00 atm. How many grams of helium are present in the gas mixture?
If a 2.5 L reaction vessel initially contains 725 torr of cyclopropane at 485C , how long will it take for the partial pressure of cylclopropane to drop to below 105 ?
Suppose a 5.00 L sample of O2 at a given temperature and pressure contains 2.73 × 1023 molecules. How many molecules would be contained in 5.00 L H2 at the same temperature and pressure?
for which K=130. assume that .406 mol of C(g) is placed in a cylinder that has a massless, frictionless piston. the temp is 300 K and the barometric pressure on the piston is constant at 1 atm. the
How many grams of methane gas (CH4) need to be combusted to produce 18.2 L water vapor at 1.2 atm and 275 K? Show all of the work used to solve this problem.
What volume of O2 gas, in liters, is required for complete reaction if the oxygen has a pressure of 386 mm Hg at 25°C?
In a test on the vaporization of water into air in a wetted-wall column, the following data were obtained: Tube diameter= 1.46 cm. Calculate the rate of mass transfer of water in air.
A 1.00 L buffer solution is 0.250 M in HF and 0.250 M in NaF. Calculate the pH of the solution after the addition of 100.0 mL of 1.00 M HCl. The Ka for HF is 3.5 x 10-4.
If a 189-mg piece of gold (density = 19.32 g/cm3) is hammered into a sheet measuring 2.4 ft 1.0 ft, what is the average thickness of the sheet in meters?
Carbon tetrachloride reacts at high temperatures with oxygen to produce two toxic gases, phosgene and chlorine. Calculate Kc for the reaction 2CCl4(g) + O2(g) = 2COCl2(g) + 2Cl2(g).
To obtain the same antifreeze protection requires 76g of propylene glycol to replace each 62g of ethylene glycol. To calculate the mass of propylene glycol required to replace 5.00gal of ethylene gl
The volume of a gas collected over water at 32 C is 627 ml. The barometer reads 752 torr (water levels are equal). What is the volume of the gas when dried and measured at STP?
Calculate the maximum mass in grams of H2S that can form when 218 g aluminum sulfide reacts with excess water according to: