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A 67.9 g mixture of the compounds sodium sulfide and potassium bromide is 40.9 % by mass sodium sulfide. The compound sodium sulfide is 41.1 % by mass sulfur. Calculate the mass (g) of sodium in the mixture.
A packed tower is used to purify a gas containing 4 mole % of H2S. The total inlet gas flow to the tower is 75 kmol/h and the total inlet pure solvent flow to be used to absorb the H2S is 95 kmol /h.
How much heat (in kJ) is needed to convert 853 g of ice at -30.°C to steam at 131°C? (The specific heat capacities of ice, steam, and liquid are 2.03 J g-1 °C-1, 1.99 J g-1 °C-1, and 4.18 J g-1 °C-1, respectively. The heat of fusion is 6.02 kJ mol..
A sample of air contains 78.08% nitrogen, 20.94% oxygen, 0.0500% carbon dioxide, and 0.930% argon by volume. how many molecules of each gas are present in 8.98 L of the sample at 87 degrees c and 6.45 atm
A solution of ammonia and water contains 2.70×1025 water molecules and 8.50×1024 ammonia molecules. How many total hydrogen atoms are in this solution. Enter your answer numerically.
From 15 mL H2O2 solution 22.0 mL gas evolved at 28.0 degrees Celcius and 740 Hgmm pressure. Calculate the concentration of the original H2O2 solution in mol/dm^3 unit.
How many milliliters of a stock solution of 11.0 NHO3 would you have to use to prepare 0.320 of 0.350 NHO3
an ice cube tray holds 455 g water. if the water initially has a temperature of 33degc how many kilojoules of heat must
A 24.60 mL sample of 0.185 M HNO3 requires 27.35 mL of a KOH solution for complete neutralization in an acid-base titration. What is the molarity of KOH
The ball is used on the driveway at temperature of -7 degree C and feels flat. What is the actual pressure of the air in the ball ? What is the gauge pressure?
When N2O5 (g) is heated it dissociates into N2O3 (g) and O2(g) according to the following reaction: N2O5(g) N2O3(g) + O2(g) Kc= 7.75 at a given temperature. The N2O3(g) dissociates to give N2O(g) and O2(g) according the following reaction:
an unknown compound has the formula CxHyOz. you burn .237g of the compound and isolate .347g of CO2 and .142g of H20. if the molar mass o te compound is 30.03g/mol, what is the molecular formula?
An aqueous solution of CaCl2 has a vapor pressure of 84.0mmHg at 50 C . The vapor pressure of pure water at this temperature is 92.6mmHg . What is the concentration of CaCl2 in mass percent?
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