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Lead 2 sulfide is the principle source of lead metal. To obtain the metal the sulfide is first heated in air to produce PbO.
PbS+3/2O2=PbO+ SO2 H=- 415.4 kj
the oxide is then reduce to the metal with carbon. PbO + C= Pb + CO H=108.5 KJ
Calculate H for the reaction of one mole of PbS with Oxygen and carbon, forming lead, sulfur dioxide and carbon monoxide.
how many moles of calcium chloride, cacl2, can be added to 1.5 liters of .020 M potassium sulfate, k2so4, before a precipitate is expected? assume that the volume of the solution is not changed significantly by the addition of magnesium sulfate.
an activation energy of 43.6 kJ/mol, what will be the rate constant for this reaction at 75oC?
Draw the Newman projections for the anti and gauche forms of 1,2-dibromoethane. The molecule has a dipole moment of 1.0 D.
what is the enthapy change needed to heat 1 kg of water at 0.4 MPa and 4°C to steam at 150°C and 0.4 MPa? b/ Does a state change from saturated vapor at 230°C to the state 100°C and 0.05 MPa represent an enthalpy increase or decrease?
The head of a strike anywhere match contains tetraphosphorous trisulfide, P4 S3. In an expriment, a student burned this compound in an excess of oxygen and found that it evolved 3677 KJ of hea per mole of P4S3 at a constant pressure of 1 atm.
A 10.00 mL aliquot of weak base is titrated with HCl. The equivalence point is reached after 17.21 mL of 0.4332 M HCl has been added. The pH is equal to 10.03 after 5.00 mL of HCl was added. Determine
What is the pressure in atmospheres inside a container of gas connected to a mercury-filled open-end manometer when the level in the arm connected to the container is 28.0cm higher than the level in the arm open to the atmosphere
Why is a mixture of alcohol and water used, rather than simply water itself, to saponify the fat or oil
If the frequency of light emitted by potassium is 9.06E14 Hz, what is the corresponding wavelength associated with this frequency in nanometers
its clay concentration and the CEC of the clay be able to estimate the draction of CEC due to organic matter in the sample
Find the nuclear binding energy of uranium-234 (atomic mass = 234.040947 amu) in utits of joules per nucleon. (Data: neutron mass = 1.674928 x 10^-24 ; proton mass = 1.672623 x 10^-24; Avogadro's Number = 6.0221367 x 10^23; c = 2.99792458 x 10^8)
calculate the amount of cobalt(II) nitrate hexahydrate [Co(NO3)2 * 6H2O] needed to prepare 50 mL of a 0.15 M cobat(II) nitrate stock
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