Molar balances sulfur

Feed gas C02 doesn t change the Appendix B s sulfur molar balance. It remains as ... 

Fig. 3.5. Volume% S02 and 02 in gas produced by burning S with excess dry air (calculated by means of S, 0 and N molar balances). N2 concentration is 79 volume% at all ratios, not shown. This is because consumption of one kg-mole of 02 produces one kg-mole of S02. ( For example, 7 kg of input air for every 1 kg of input sulfur.)...

Sulfuric acid compositions are expressed in mass%. For this reason, acidmaking calculations are more easily done with mass (rather than molar) balances. 

H2S stoichiometric coefficient can be determined by mass balance. By employing data of sulfur content in liquid at the entrance and exit of the reactor, the amount of sulfur that reacts can be calculated. Then, having the amounts of hydrogen sulfide in liquid and in gas phase, the following molar balance for H2S during HDS reaction can be established ... 

The temporal change of the molar quantity of the element sulfur in the film on a fluidized-bed particle is caused by inflow and outflow of the material. This mass balance is needed only once, since the fluidized-bed particles and, thus, the liquid films on the particles are regarded as ideally mixed. The condition of the ideal mixing leads to the fact that with the mass and energy balance of the film, the average variables of state of the gas in the respective driving force approximations find the following form... 

For the determination of the unknown quantities in the liquid film, three further secondary conditions are needed. So, it is necessary to divide the molar masses of the sulfur and the calcium resulting from the mass balances in the film. A sulfur atom is bonded in hydrogen sulfite ion, molecular diluted sulfur dioxide, sulfite ion and calcium sulfite hemihydrate... 

It required 36.45 mL of 0.115 M NaOH to just exactly neutralize the acid in 25.00 mL of H2S04(aq). What was the molarity of the sulfuric acid The balanced equation is ... 

What volume of hydrogen gas is produced if 2.16 g of zinc metal are consumed with sulfuric acid The hydrogen gas is measured at 748 mmHg and 22°C. The molar mass of zinc is 65.4 g. The balanced equation is... 

Problem Is How many milliliters of 0.500 M sulfuric acid, H2SO4(aq), are needed to just completely react with 12.0 g of sodium hydroxide, NaOH The molar mass of NaOH is 40.0 g, and the balanced equation for the reaction is... 

The balanced equation for a titration reaction is the key to calculating the unknown molarity. For example, sulfuric acid is titrated with sodium hydroxide according to this equation. 

A metallurgical firm wishes to dispose of 1300 gallons of waste sulfuric acid whose molarity is 1.37 M. Before disposal, it will be reacted with calcium hydroxide (slaked hme), which costs 0.23 per pound, (a) Write the balanced chemical equation for this process, (b) Determine the cost that the firm will incur from this use of slaked lime. 

The usefulness of the molarity concentration unit is readily apparent when dealing with reaction stoichiometry. For example, suppose that you want to know how many milliliters of 2.50 M sulfuric acid it t es to neutralize a solution containing 100.0 grams of sodium hydroxide. The first thing you must do is write the balanced chemical equation for the reaction ... 

The original product sold in the United States contains -30% lithium hypochlorite (35% available chlorine), 34% sodium chloride, 20% of potassium and sodium sulfates, 3% lithium chloride, 3% lithium chlorate, 2% lithium hydroxide, 1% lithium carbonate, and the balance is water. It is made from lithium sulfate that is extracted into water from a lithium aluminum silicate ore after it is treated with sulfuric acid. The resulting solution also contains sodium and potassium sulfates. It is neutralized with calcium carbonate to pH 6, treated to remove calcium and magnesium, filtered, and concentrated. Sodium hydroxide is added to convert lithium carbonate to lithium hydroxide. The solution is cooled to 0°C and the resulting sodium carbonate decahydrate crystals are removed by filtration. Slightly more sodium hydroxide than the molar equivalent of lithium hydroxide is then... 

The flow needs to be cooled at the outlet of each bed if a high final conversion is to be achieved. In this example, we optimize the inlet temperatures of each bed to maximize the final conversion of the reactor. The SOj entering the reactor is 10% of the total inlet feed, the pressure is assumed to be 1 atm, and the temperature, 600 K. We start with sulfur as the initial raw material, which is burned with dry air and later oxidized. We need to dry the atmospheric air in order to avoid any corrosion due to early formation of sulfuric acid. For 1 kmol of air, the mass balance for the combustion of sulfur and the formation of SO3 is given in Table 11.1, where a is the molar fraction of SO2 in the feed to the converter. We first determine the equilibrium curve. The amount of moles at equilibrium is given by... 

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