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Consider a sample that consists of three green spheres and one blue sphere. The green mass is 2.00 g, and the blue mass is 3.00 g. Calculate the fractional abundance of each sphere in the sample.
A gas of unknown molecular mass was allowed to effuse through a small opening under constant-pressure conditions. It required 125 for 1.0 of the gas to effuse. Under identical experimental condition
Draw two equivalent resonance forms for nitric acid and three for nitrate ion. Rank the three types of nitrogen-oxygen bonds in order of length.
After treating an antacid with 5.00 ml of .1065 M NaOH, the untreated acid was diluted to exactly 250 mL with distilled water in a volumetric flask. 25.00 mL of that diluted acid required 17.03 mL o
The standard change in free energy at 122oC is -6.001 kJ for the reaction A(s) + 2 B(g) ? AB2(g) We prepare a mixture at 122oC in a sealed 3.020 L vessel to contain 0.0370 mol A, 0.509 atm B, and 0.
The substance X is an element which has the elemental form of X(s) at 25oC. The standard enthalpy of formation of HXO4(g) is -818.0 kJ/mol at 25oC. The standard entropy of HXO4 (g) and X(s) are, res
What is the partial pressure of SO2(g) in the larger container. What is the partial pressure of N2(g) in this vessel. What is the total pressure in the vessel
A mixture of gases contains 10.20g of N2 , 1.80g of H2, and 8.15 of NH3 . The total pressure of the mixture is 1.90atm. What is the partial pressure of N2? What is the partial pressure of H2. What i
How many grams of hydroxyapatite will dissolve in 1.00 L of H2O? Ksp= 2.34*10^-59; Molar mass=502.3 g/mol Ca5(PO)3OH = 5Ca^2+ +3 PO4^3- +OH^-
write a balance equation for the formation of C4H10O(i) from its elements (c) By using the information in this problem and data in Table 5.3, calculate ?H°f for diethyl ether
Draw a Newman projection of the most stable conformation of (2R, 3S)-dibromobutane sighting down the C2-C3 bond.
The addition of bromine to ethene in the presence of high concentration of chloride ion in an inert solvent results in the formation of 1,2-dibromoethane and 1-bromo-2-chloroethane. No 1,2-dichloroe
An unknown amount of KCl was added to 250 mL of water @ 35 degrees C and formed a clear solution. The temperature was lowered to 25 degrees C, and the solution remained clear. Was the solution at 35
The addition of bromine to ethene in the presence of high concentration of chloride ion in an inert solvent results in the formation of 1,2-dibromoethane and 1-bromo-2-chloroethane.
Hypochlorous acid is a weak acid with pKa= 7.41 suppose a 45.00ml sample of 0.240 M HOCL solution is titrated with a 0.250 M standard KOH solution. what is the PH of the equivalence point
Calculate the amoun of NO2 in moles present at equilibrium. Calculate the percentage of the original N2O4 that is dissociated
How many moles of chloride were present in the unknown. d. What mass of cholride was present in the unknown? e. What was the mass percentage of cholride present int the original sample
The concentration of sulfuric acid, H2SO4 is 36M. What volume is required to prepare 6.0 L of 0.12 M acid
A piston has an external pressure of 14.0 . How much work has been done if the cylinder goes from a volume of 0.180 liters to 0.650 liters.
Write an equation for a reaction of Fe2O3 (s) and C(s) to give Fe(s) ad CO(g). How does delta G vary with temperature? Is there a temperature at which the reaction is spontaneous
The ionization constant for the weak acid HA is 4.0 x 10^-8. Calculate the equilibrium concentration of H+, A- and HA in a 0.050 M solution of the acid.
After treating an antacid tablet with 5.00mL of 6M HCl, the unreacted acid was diluted to exactly 250mL with distilled water in a volumetric flask. 25.00 mL of that diluted acid required 17.03 NaOH
Determine the ionization constant of a 0.0070 aqueous ammonia solution with an OH- concentration of 3.46 x 10^-4 M.
Determine the Ka of a 0.1M solution of acetic acid in which the hydronium ion concentration is 1.35 x 10^-3 M
What is the pH of 0.0045 M solution of Aluminum Hydroxide. Al(OH)3 dissociates in a complicated why so I am not sure if I simply find the -log of the concentration