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What is the pH of a propanoic acid - propanoate buffer that is 0.25M in CH3CH2COONa and 0.15M with respect to CH3CH2COOH? Ka for propanoic acid = 1.3 x 10^(-5).
Water supply in a city is fluoridated by adding NaF. The preferred concentration of F- is 1.6ppm.calculate the amount of Naf in milligrams should be added per gallon (treated water) if the water supply is 0.2 ppm in F-?
A 0.440 g sample of butyric acid (an organic acid consisting of C, H, and O atoms) is combusted in excess oxygen, yielding 0.882 g CO2 and 0.360 g H2O.
Calculate the length in km of a row containing 1 mole of hydrogen atoms laid side to side if diameter of a hydrogen atom =.212 nm?
At 100 degrees C, the vapor pressure of water, methanol, and ethanol are 760, 2625, and 1694 torr, respectively. Which counpound has the highest normal boiling point.
The most common source of copper is the mineral chalcopyrite (CuFeS2) how many kilograms of chalcopyrite must be mined to obtain a 440 grams of pure copper.
The specific heat of fat is 0.45 cal/(g C) and the density of fat is 0.94g/cm^3 . How much energy (in calories) is needed to heat 10cm^3 of fat from room temperature (25 C) to its melting point (35 C).
500cm3 of 0.250M of Na2SO4 is added to an aqueous solution of 15.0g of BaCl2 resulting in a white precipitate of insoluble BaSO4.
Following a terrorist release of Cesium-137 (half-life of 30 years) in downtown, clean up efforts were successful in removing all but 100 curies. How long will it take for the contamination to decay to about 5 curies?
Calculate the binding energy of the 2s electron in iron and calculate the binding energy of the 2s electron in iron. Does the new energy agree better with experiment?
Using Le Chatelier's Principle to predict the effect of a change in conditions on a chemical equilibrium - Predict how the equilibrium of the following reactions will be affected by the changes listed.
find out the ΔH rxn for the given reaction as C 3 H 4 (g) + 2 H 2 (g) → C 3 H 8 (g)
A copper refinery produces a copper ingot weighing 121 lb. If the copper is drawn into wire whose diameter is 8.00 mm, how many feet of copper can be obtained from the ingot.
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