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What volume of glacial acetic acid (d= 1.06 g/mL) and what weight of solid potassium acetate are required to prepare 5 liters of 0.2 M acetate buffer, pH 5.0?
Use the tabulated half-cell potentials to calculate the equilibrium constant (K) for the following balanced redox reaction at 25°C. Pb2+(aq) + Cu(s) ? Pb(s) + Cu2+(aq)
How much of methane gas will be produced in anaerobic decomposition assuming a complete conversion of MSW into CH4CO2NO, and SO2.
A 275mL sample of O2 is collected over water at 60 degrees C the total pressure 755 torr what is the volume of O2 at STP?
A quantity of N2 occupies 62.2 L at a particular temperature and pressure. Its density is 0.900 g/L. How many moles of N2 are in the container?
Use the periodic table to write electron configurations for each of the following elements. Represent core electrons with the symbol of the previous noble gas in brackets. For example, [He]2s^2 2p^2.
what is the concentration of oxygen in air-saturated water at 25 degrees C and .85 atm? Assume that the mole fraction XO2 is .209 and Henry's law constant for oxygen
The voltage across the leads of a glass pH-reference combination electrode immersed in a solution of pH 8.00 was 133 mV. Calculate the expected voltage if the pH of the solution is raised to 9.00
The enthalpy and entropy values are listed beneath each substance: 2 A + B ? 3 C + D ? Hf (kJ/mole) - 200 -50 -18 - 25 ? s (J/moleK) 25 40 300 75
A sample of an unknown gas effuses in 11.3 min. An equal volume of H2 in the same apparatus at the same temperature and pressure effuses in 2.72 min. What is the molar mass of the unknown gas
An unknown compound has a melting point of 121 - 122 °C. Melting point of a mixture of pure benzoic acid and your unknown sample was 116-122 °C. Melting point of a mixture of 2-naphthol and your unknown sample was 110 - 116 °C. What is your unknow..
the reaction 2ararrbc has a kc of 0.2. the reaction is commenced with initial con- centrations a 0.2 m b 0.2 m and c
(a) What was the molar concentration of acetic acid in the vinegar (b) Assuming the density of the vinegar to be 1.1 g/mL, what was the percent (by mass) of acetic acid in the vinegar
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