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The density of pure water at 25 degrees Celsius is 0.997 g/mL. Considering water as being both solvent and solute, calculate its molality, moles of solute per kilogram of solvent at 25 degrees Celsius.
In a particular redox reaction, Cr is oxidized to CrO42 and Ag is reduced to Ag. Complete and balance the equation for this reaction in acidic solution. Phases are optional.
A 27.0-g sample of water at 250. K is mixed with 47.0 g water at 310. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
What is the BOD concentration just downstream of the discharge point? (b) If the stream has a cross-sectional area of 10 m2, "what is the BOD concentration 50 km downstream? (BOD is removed with a first-order decay rate con- stant equal to 0.20/da..
How would the observed molarity of your experiment be affected by the following circumstances. (i.e. would it be higher than the true value, lwer than the ture vaule or remain unchaged?)
Titration of an oxalate sample gave the following percentages of percent oxalate: 12.28%, 12.54%, and 12.24%. Calculate the average and the standard deviation.
a sample of hydrogen gas was collected over water at 36degc and 855 mm hg. the volume of the container was 6.50 l.
1.00 mole of an ideal gas (Cv,m=12.47 J mol-1 K-1) is initially at 300 K and in 10 L and is expanded to 20 L in two different ways described below. Compute w, q, deltaU, delta S, and delta S total for both of these two processes.
After allowing the solution to sit for 30 minutes the student determines that the bromide concentration was [Br-]= 0.0012 M. What is the Pb2+ concentration?
A 12.00 g sample of manganese is heated and allowed to react completely with the oxygen in the air to form an oxide having a mass of 18.99 g. What are the moles for each component? Also, what is the whole number ratio of manganese to oxygen.
The handling of sodium bicarbonate is difficult due to the release of co2 during the adjustment of the pH, why can't other bases known be be easy to handle such as sodium hydroxide be used
Dry ice is solid carbon dioxide. A 1.87g sample of dry ice is placed in an evacuated 4.03 L vessel at 22 degrees C. Calculate the pressure inside the vessel after all the dry ice has been converted to CO2 gas
As a technician in a large pharmaceutical research firm, you need to produce 350. mL of 1.00 M potassium phosphate buffer solution of pH = 7.28. The pKa of H2PO4- is 7.21.
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