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What is the pH halfway to the equivalence point for the titration of 0.20 M CH3NH2 with 0.20 M HCl? (Kb of CH3NH2 = 4.4 x 10-4)
A. 10.6
B. 3.4
C. 9.3
D. 4.7
E. 7.0
Nitrogen and hydrogen combine at high temperature, in the presence of a catalyst, to produce ammonia. N2(g) + 3H2(g) --> 2NH3(g) Assume 0.170 mol of N2 and 0.543 mol of H2 are present Initially
if 5.25mL of 0.1000 M NaOH solution is needed to just neutralize excess acid after 20.00 mL of 0.1000 M HCl was added to 1.00 g of an antacid, how many moles of acid can the antacid counteract per gram.
The air in an inflated balloon (defined as the system) warms over a toaster and absorbs 121 J of heat. As it expands, it does 70. kJ of work. What is the change in internal energy for the system.
ideal gas in 2.0 L what will be the volume of the gas if the pressure on the container is doubled while the temperature is reduced from 400 K to 200 K.
What is the mass in grams for each of the following: a) 5.12 mol of Al, b) .75 mol of Cu, c) 3.52 mol of MgBr2, d) 0.145l of C2H6O, e) 2.08 mol of (NH4)2SO4.
A sample of gas with a mass of 1.58 occupies a volume of 941 at a pressure of 753 and a temperature of 16. What is the molar mass of the gas.
If 30mL of 6.8M H2SO4 was spilled , what is the minimum mass of NaHCO3 that must be added to the spill to neutralize the acid.
The density of pure silver is 10.5 g/cm^3 at 20°C. If 4.63 g of pure silver pellets is added to a graduated cylinder containing 12.1 mL of water, to what volume level will the water in the cylinder rise.
An antacid tablet contraining calcium carbonate as an active ingredient required 9.53 mL or 0.0956 M H2S04 for comlete neutralization.
Calculate the [H3O+] and the pH for a buffer that consists of 0.13 M HF and 0.29 M KF. (Ka of HF = 6.8x10^-4)
Silicon has a band gap of 1.1 eV at room temperature. What wavelength of light would a photon of this energy correspond to?
How many grams of oxygen are collected in a reaction where 222 mL of oxygen gas is collected over water at a temperature of 25°C and a total pressure of 697 torr?
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