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1. A mixture of ethane and methane is contained a glass bulb of 500 cm^3 capacity at 25 degree celsius. the pressure is 1.25 bar and the mass of the gas in the bulb is 0.53 grams. what is the average molar mass and what is the mole fraction of methane
2. Experiment by sir williams ramsey and by lord rayleigh around 1894 led to a gas residue remaining when all of the then known components of air had been removed. the density of the residue was 1.61 gm/liter at 25 degree celscius. what element had they obtained?
3. What is the volume of one mole of ethane at 350k and 70 bar according to (a) the ideal gas law (b) the van der waals equation
A sample containing 0.187 g Cl- is dissolved in 50.0 mL water. How many moles of Cl- ion are in the solution? What is the molarity of Cl- ion in the solution?
Find the pH and volume (mL) of 0.0372 M NaOH needed to reach the equivalence point(s) in titrations of 20.0 mL of 0.0892 M H2SO3 (two equivalence points)
NaOH + CO2 -> Na2CO3 + H2O. If the average human body discharges 745 g of CO2 per day, how much NaOH is needed each day for each person in the spacecraft.
500.0 mL of 0.160M solution of H3PO4 is combined with a 300.0 mL of a 0.245M solution of Ba(OH)2. What is the maximum mass of solid Ba3(PO4)2 that can be collected
A saturated solution of Mg(OH)2 is prepared and allowed to equilibriate at 25 degrees celcius. A 25.00 mL sample of the 25 degrees celcius solution is titrated with 0.00508M HCL solution. 1.38 mL of the HCL solution are required to fully react the..
liquid stream containing ethane and propane enters a flash chamber operated at 80 oF and 300 psia. Leaving the chamber, the vapour stream flow rate leaving the chamber
85.2 g sample of compound X4O10 contains 48.0 g of oxygen atoms. what is the molar mass of element x
A 85.0 mL sample of 0.175 M. proprionic acid, HC3H5O2 (Ka = 1.30 X 10-5) is titrated with 0.125 M. KOH. What is the pH after 50.0 mL of the KOH have been added
Potassium metal reacts violently when added to water according to the balanced equation: 2K(s) + 2 H2O (I) > 2KOH(aq) + H2(g). How many moles of H2O are needed to react completely with 7.54 mol of K
Methanol, ethanol, and n-propanol are three common alcohols. When 1.00 g of each of these alcohols is burned in air, heat is liberated. Calculate the heats of combustion of these alcohols in kJ/mol.
The Kf for Cu(en)2^2+ is 1 x 10^20. What is the concentration of Cu^2+ (aq) in the solution?
Calculate the expected pH of a 0.100 M of ammonium chloride given that Kb for ammonia is 1.76 x 10^-5.
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