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1. The Ka of a monoprotic weak acid is 3.14 × 10-3. What is the percent ionization of a 0.179 M solution of this acid?
2. Enough of a monoprotic acid is dissolved in water to produce a 0.0186 M solution. The pH of the resulting solution is 2.30. Calculate the Ka for the acid.
3.A certain weak base has a Kb of 7.50 × 10-7. What concentration of this base will produce a pH of 10.26?
The pH of a bicarbonate-carbonic acid buffer is 6.95. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-)
The specific heat of liquid water is 4.184 J/g x C. Calculate the energy required to heat 10.0 g of water from 26.5 C to 83.7 C.
As gas expands from 1.00 L to 2.50 L against constant pressure of 820 torr. Calculate the change in internal energy for the gas, if 120 J of heat is transferred to the gas during the expansion.
Calculate the molar mass of a vapor that has a density of 1.58 g/L at 23.2 oC and 610. torr. 2. If the volume of a container is 39.4 L. and the container holds a gas at 13.2 oC. and 7.00x104 torr.
a soulution is prepared by mixing 25.0ml of .100M HCL and 2.00mL of .200M NaCl. what is the molarity of the chloride ion solution
The equilibrium constant Kc for the decomposition of phosgene, COCl2, is 4.63 10-3 at 527°C. COCl2(g) CO(g) + Cl2(g) Calculate the equilibrium partial pressure of all the components
A concentrated sulfuric acid solution is 74.0% H2SO4 by mass and has a density of 1.66 g/mL at 20°C. (MW of H2SO4 is 98.0 g/mol.) The molality of the H2SO4 solution is ?
The activation energy for a particular reaction is 95 kJ/mol. By what factor will the rate constant increase when the temperature is increased from 50 oC to 62 oC?
4 Fe(s) + 3 O2(g) → 2 Fe2O3(s). If 12.5 g of iron(III) oxide (rust) are produced from 8.74 g of iron, how much oxygen gas is needed for this reaction?
If a 1000 kilogram sample of rock is 0.021% gold by mass. How much zinc is needed to react with the gold extracted from the rock?
The vapor pressure of a mixture of 400 g of carbon tetrachloride and 43.3 g of an unknown compound is 137 torr at 30 °C. The vapor pressure of pure carbon tetrachloride at 30 ºC is 143 torr
A colorless liquid A (C3H6O) was soluble in water and ether, and had a boiling point of 94-96 degrees Celsius. It decolorized a Br2-CH2Cl2 solution and gave a positive ceric nitrate test
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