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Suppose you were to prepare a buffer solution using ammonia and ammonium chloride. What would be the molar ratio of acid to its conjugate when the pH was adjusted to each of these values? (Kb = 1.8 10-5)
(a) pH = 10.21
(b) pH = 9.38
(c) pH = 8.26
What is the mass of a magnesium block that measures 2.3 cm * 3.5 cm * 1.5 cm? The density of magnesium is 1.738 g/cm^3
How much heat is associated with the burning of 3.52 g of methane in the following unbalanced reaction: CH4(g) + O2(g) ?CO2(g) + H2O(g)
How many grams of nitrogen dioxide (NO2) are required to produce 260 grams of nitrogen monoxide, NO?
For the titration of 50.00 mL of 0.0200 M 2-(N-Morpholino)ethanesulfonic acid with 0.09900 M NaOH, calculate how much titrant (mL) is required to reach a pH of 9.29 mL in the receving flask.
A certain reaction has an activation energy of 61.0 kJ/mol and a frequency factor of A1 = 2.00×10^12M^-1s^-1. What is the rate constant, k, of this reaction at 29.0 degrees celsius
What is the approximate ?H in kJ for the following reaction as written: 2NH3(g) --> 3H2(g) + N2(g) Careful, what kind of bond does the nitrogen molecule make
12 grams of hydrogen is combined with 104 grams of oxygen as an explosive reaction that forms water as its sole product. All the hydrogen reacts but 8 grams of oxygen remain. How many grams of water is formed?
As a result, the pressure inside the vessel drops to 30.64 atm at 25 C. Calculate the final percent by mass of ozone in the vessel.
Consider the malate dehydrogenase reaction from the citric acid cycle. Given the following concentrations, calculate the free energy change for this reaction at 37.0 °C (310 K). ?G°\' for the reaction is 29.7 kJ/mol. Assume that the reaction occur..
As a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the potential to kill weeds effectively
The gas mixture contains 2.5% sulfur dioxide (SO2) by weight. How many pounds of SO2 are released in one week? (Sig figs matter)
The vapor pressure of water at 45.0 degrees celcius is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K2CO3 at this temperature (assume 100% dissociation)
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