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A sample contained a mixture of ZnS and HgS. The amount of ZnS was determined by reacting 11.06 g of the sample with an excess of HCl to release H2S from each compound; ZnS(s) + 2 HCl(aq) ® ZnCl2 + H2S(g) HgS(s) + 2 HCl(aq) ® HgCl2 + H2S(g) If the sample reacted completely and produced 2143 mL of hydrogen sulfide at 29.06 °C and 699.2 mm Hg, what was the mass percentage of ZnS in the mixture?
If a vessel containing NO2 has an initial concentration of 2.8 x 10-2 mol/L, how long will it take for 75 of the NO2 to decompose? The decomposition of NO2 is second order in the reactant and the rate constant is 1.1 L/mol x s.
How is the vapor pressure of a liquid at a given temperature related to the strength of intermolecular forces
Small quantities of oxygen can be prepared in the lab by heating potassium chlorate, KCIO3(s) 2KClO3 -> 2KCl+3O2 Calculate how many grams of O2(g) can be produced from heating 59.4g of KClO3(s)
A sealed container holds 1.00 mole of helium and 2.00 moles of nitrogen at 30.0°C. When the total pressure of the mixture is 666 mm Hg, what is the partial pressure of the nitrogen? Provide an answer correct to 2 significant figures in mmHg.
how many moles of oxygen gas will be produced by the decomposition of 111.5 g of lead(II)oxide.
Begin your explanation by identifying the intermolecular forces of attraction of the solute and the solvent.
One way to measure ionization energies is ultraviolet photoelectron spectroscopy (UPS, or just PES), a technique based on the photoelectric effect. In PES, monochromatic light is directed onto a sample, causing electrons to be emitted.
A sample of .755g of NaHCO3 was dissolved in 25mL of .960 M HCl. After heating, 6.7 mL of .601 M NaOH was needed to neutralize the excess acid that was not neautralized
What are the units of the universal gas constant R? When can a real gas behave as an ideal gas? Are these conditions met in this experiment?
The decomposition of N2O to N2 and O2 is a first- order reaction. At 730°C the half-life of the reaction is 3.58 3 103 min. If the initial pressure of N2O is 2.10 atm at 730°C, calculate the total gas pressure after one half-life.
Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water. From 164.5 degrees C to 179 degrees C, the rate constant increases by a factor of 4.27. What is the activation energy of this oxidation reaction
What technology or combination of technologies would you recommend for treating the following contaminated air streams?
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