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A sample of gas weighs 4.542 grams and has a volume of 870.0 mL at 945.0 torr and 39.0 degrees Celsius. What is its molar mass
Calculate the pH of the solution formed by the addition of 55.5 mL of 0.100 M NaOH to 49.2 mL of 0.100 M H3PO4.
A 3.00L container is rated to hold gas at a pressure no greater than 100atm. Assuming the gas law behaves ideally, what is the maximum number of moles a gas that this vessel can hold at 27 degrees C
A beaker with 170 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 8.70 mL of a 0.370
How many kilojoules of heat are absorbed when 40.6 of mgo is decomposed into mg and O2 at constant pressure
Chlorine gas is to be heated from 100oC and 1 atm to 200oC a. Calculate the heat input (kW) required to heat a stream of the gas flowing at 5 kmol/s at constant pressure
What is the minimum concentration of Mg2+ required to begin precipitating Mg(OH)2(s) in a solution of pH 10.82? For Mg(OH)2
How many grams of dry NH4Cl need to be added to 2.50 L of a 0.500 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.74? Kb for ammonia is 1.8*10^-5.
A tanker carrying 800 kg of BOD waste accidently overturns and spills into a pond with a volume of 100,000,000 L. Assume the pond is completely mixed and has an initial DO of 6.4 mg/L and a temperat
The saturation value of DO is 8.5 mg/L. The deoxygenation coefficient (kd) is 0.61/d, and the reaeration coefficient (kr) is 0.76/d. Assume complete and instantaneous mixing of the sewage and river.
Some wastewater has a BOD5 of 150 mg/L. The reaction rate is 0.23/d. What is the ultimate carbonaceous BOD
The initial DO of the mix is 9.0 mg/L. After 5 days, the DO is 4.0 mg/L. After a long period of time, the DO is 2.0 mg/L, and it no longer seems to be dropping. Assume nitrification has been inhibit
A voltaic cell operating under standard conditions (1.0 M ion concentrations) utilizes the following reaction: 3 Pb(s) + 2 Co3+(aq) <=> 3 Pb2+(aq) + 2 Co(s) What is the effect on the cell emf
A sample of gas weighs 4.542g and has a volume of 870.0mL at 945.0 torr and 39.0 degrees Celsius. What is the molar mass
The four unit separation train shown in figure 1.1 has been designed to separate 1000 gmol/hr of a hydrocarbon feed containing 20% CH4, 25 % C2H6
What radioactive isotope emits a beta particle to give magnesium-24? a. sodium-24 b. silicon-28 c. aluminium-24 d. magnesium-25
What is also produced when aluminium-27 is bombarded with deuterium to give aluminium-28? a. neutron b. proton c. positron d. electron
The element silicon has 3 isotopes with the masses and natural abundances shown in the table. Mass of Isotope Natural abundance 27.97693 92.23 28.97649 4.67 29.97376 3.10 What is the average atomic
Assume the value of Delta H for this reaction is -3.8*10^2 kJ/mol The formula is 4. 2HCl (l) + Mg (s) ??? MgCl? (s) + H? (g) Assume magnesium reacts with excess HCL. Calculate the heat that would be
A particular X-ray microscope can measure the position of a particle to with 1.0X10^-10 m. What is the minimum error in the momentum (mv)
Using the van der Waals equation of state, what is the pressure of 1.423 mol of helium in a container of volume 5.412 L and a temperature of 25.0 C
The root-mean-square (rms) speed of a sample of molecules was found to be 1.8 x 10^3 m s at 25C. After heating, the rms speed was found to be 4.6 x 10^3 m s. What was the temperature of the sample a