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In a certain experiment, 4.90 g of NH3 reacts with 7.55 g of O2. with: 4 NH3 (g) +5 O2(g) -> 4NO(g) +6 H2O (g) How many grams of NO will be formed?
A 100.0 mL sample of 0.10 M NH3 is titrated with 0.10 M HNO3. Determine the pH of the solution after the addition of 200.0 mL of KOH. The Kb of NH3 is 1.8 × 10-5.
What is the chemical reaction of this chemical equation. AgNO+ NaCI- AgCI+ NaNO
A compound is 40.0% C , 6.70% H, and 53.3% O by mass. Assume that we have a 100.-g sample of this compound. The molecular formula mass of this compound is 240 amu. What are the subscripts in the act
What is the purpose of using a drying agent on the organic layer after a separation? How can you tell if the extracted solution is "dry"?
A solution of caffeine in chloroform as a solvent has a concentration of 7.9 x 10^-2m. What's the percent of caffeine by mass? Calculate the mole fraction of caffeine.
Metallic aluminum reacts with at elevated temperatures to form manganese metal and aluminum oxide. A mixture of the two reactants is 67.2% mole percent. Find the theoretical yield (in grams) of mang
Which one of the following cell combinations would best be used to set up a cell with a potential of 0.50V by adjusting the half-cell ion concentrations?
What is the hybridization of the central atom in SO2Cl2?
Calculate the specific heat of molybdenum metal in {rm J/(g cdot ^circ C)}. The specific heat of water is 4.184{rm J/(g cdot ^circ C)}.
The solvent benzene has a normal freezing point of 5.5 C if 1.00 g of an unknown dissolves in 20.0 g of benzene gives a solution with a freezing point of 4.2 what is the molecular weight of the unk
If the reaction Fe2N (s) + 3/2 H2 (g) -> <- 2Fe(s) + NH3(g) comes to equilibrium at a total pressure of 1 atm, analysis of the gas shows that at 700 K and 800 K pNH3/pH2 = 2.165 and 1.083, res
Assume that we have a 100.g sample of this compound. What are the subscripts in the empirical formula of this compound?
HCL acid solution is standardized using 0.502g of sodium carbonate. Find the molarity of the acid if 30.5mL are required for the titration.
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
How much energy in kilojoules is required to change 47.6 g of ice at 0 degrees celsius to liquid water at the same temperature in kilocalories?
Calculate the mass of propylene glycol (C3H8O2) that must be added to 637 g of water to reduce the vapor pressure by 4.74 torr at 40°C. The vapor pressure of pure water at 40°C = 55.3 torr.
Benzoic acid is a monoprotic weak acid with Ka= 6.30 x 10 to the 5 negative. What is the pH of a solution of benzoic acid that is .559M in benzoic acid and has a2.25 X 10 to the 2 negative added?
What mass of sucrose should be combined with 474 of water to make a solution with an osmotic pressure of 8.55 at 310 ? (Assume the density of the solution to be equal to the density of the solvent.)
A 15.00 mL sample of this stock solution is added to 57.00 mL of water. Calculate the concentration of ammonium ions and sulfate ions in the final solution.
What weight of a can be removed from a soluton that contains 6.00 grams of a in 50.0-mLs of water by a single extraction using 50.0 mLs of ligroin?
A 2.00-g sample of white solid was vaporized in a 345-mL vessel. If the vapor has a pressure of 985 mmHg at 158°C, what is the molecular mass of the solid?
What measuring device would you use to measure the volume under each of the conditions described below? In some cases, there may be more than one answer to the question.
If the specific heat of the mixture is 4.184 J g-1 degree C1, and the small heat capacity of the calorimeter is ignored, what is the heat evolved, per mole of sodium hydroxide?
The crystal structure of lithium sulfide (Li2S) is pictured here. The length of the unit cell is 5.88 x 10^2. For this structure, determine: