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A sample of an unknown gas effuses in 10.5 min. An equal volume of H2 in the same apparatus under the same conditions effuses in 2.07 min. What is the molar mass of the unknown gas?
Suppose that a sample of gas occupies 73 mL of volume at 25C and a pressure of 266 torr. What would be the volume if the pressure were changed to 645 torr at 25C?
A 45-year-old woman is receiving a ‘combined modality' treatment for the initial stage of breast cancer. State the two aspects included in this treatment. State the methods by which a radiati
How large (in kg) an oxygen candle (KClO3) would be needed to supply 8 people with enough oxygen for 24 hours on a small submarine? Although this depends on the size of the person and their respira
Mercury has a density of 13.6 g per mL. A barometer holding 9.50mL of mercury has broken. The cost of mercury disposal is based on mass. How many kilograms of mercury were in the barometer?
An Auto mechanic spills 91 mL of 2.3 M H2SO4 solution from a rebuilt auto battery. How many milliliters of 1.5 M NaHCO3 must be poured on the spill to react completely with the sulfuric acid?
Clausthalite is a mineral composed of lead selenide (PbSe). The mineral adopts a NaCl-type structure. The density of PbSe at 25C is 8.27g/cm^3. Calculate the length of an edge of the PbSe unit c
If the gas inside the empty container was initially at a pressure of 1 atm, what pressure did it reach inside the incinerator? Assume the gas was at constant volume and the can did not explode.
What is the total number of joules absorbed by 65.0 g of water when the temperature of the water is raised from 25.0 degrees celsius to 40 degrees celsius?
What is the molarity of a solution of 14.0 g NH4Br in enough H2O to make 150 mL of solution?
The vapor pressure of pure water at 70°C is 235 mm Hg. What is the vapor pressure depression of a solution of 125 g of the antifreeze ethylene glycol, C2H6O2, a nonvolatile compound, in 205 g of
How many kilojoules of heat are released when 42.4 g of CH3OH at 55 degree celsius is cooled to 15.5 degree celsius. specific heeat capacity is 2.5 j/(g degree celsius)
A proton in a linear accelerator has a de Broglie wavelength of 117pm. What is the speed of the proton?
Calculate the amount of N2 gas released (in liters at 37oC and 1 atm) when the diver returns to the surface of the water, where the partial pressure of N2 is 0.80 atm.
What is the total vapor pressure4 at 20° C of a liquid solution containing 0.30 mole fraction benzene, C6H6, and 0.70 mole fraction toluene, C6H5CH3?
What is the formula for the dissolution of Sodium Propionate in Water?
A 155 g sample of an unknown substance was heated from 25.0°C to 40.0°C. In the process, the substance absorbed 5696 J of energy. What is the specific heat of the substance?
A solution of 0.312 M KOH is used to titrate 15.0 mL of a H2SO4 solution. write the balanced chemical equation. What is the molarity of the H2SO4 solution if 28.2 ml of the KOH solution is required
Acetylene gas (C2Hs) is produced as a result of the reaction CaC2(S)+2H2O(l)-> C2H2(g)+Ca(OH)2(aq). if 27g of CaC2 are consumed in this reaction, how much H2O is needed?
2CH3OH+3O2 gives 2CO2+4H2O. Calculate the heat of combustion of one mole of methanol under standard conditions.
how many grams of lead chromate form when a 1.00g sample of Pb(NO3)2 is added to 25.0 mL of 1.00 M K2CrO4 solution.
Calculate the k value associated with the reaction at 25 degrees celcius given the Gibbs free energy of formation of N2H4 is -419.15Kj/mol.
A proton in a linear accelerator has a de Broglie wavelength of 138 pm. What is the speed of the proton?
At a certain temperature and pressure 2.8 L of N2 reacts with 4.2 L of O2. If all the N2 and O2 are consumed, what volume of N2O3, at the same temperature and pressure, will be produced.
A 0.0050 molar solution of sugar is separated from pure water by a membrane at 20C. What is the osmotic pressure?