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Methylamine (CH3NH2) is a weak base. In a 0.100 M solution, 6.30% of the base is ionized. What is its Kb
The value of ?Ho for the reaction below is -126 kJ. The amount of heat that is released by the reaction of 25.0 g of Na2O2 with water is ________kJ. 2Na2O2 (s) + 2 H2O (l) -> 4NaOH + O2 (g)
If the concentration of H2 in the equilibrium mixture is 0.426 M, what mass of methanol was initially introduced into the vessel?
What is the mass percent, expressed to the proper number of significant figures, for each metal in the original metal mixture? Define all variables, show units, and show algebraic steps to your the answers.
how many whole drops (.05 mL/drop) of 6 M HCl are required to dissolve the calcium carbonate? b) What is the Ca concentration when this is dissolved and diluted to 100.00mL
a sample of oxygen gax occupies a volume of 250ml at 740 torr presure, what volume will it occupy at 800 torr pressure?
Assuming complete dissociation of the solute, how many grams of \rm KNO_3 must be added to 275 \rm mL of water to produce a solution that freezes at -14.5 ^\circ {\rm C}? The freezing point for pure water
emitted into the atmosphere. The half-life of krypton-85 is 10.76 years. What fraction remains after 25 years?
Which of the following acid-base pairs would work best for a laboratory experiment requiring a pH of 6.8? What molar ratios of the compounds would you use to prepare the solution?
Joe makes up a aqueous solution of a copper salt from some ore samples he has found in Contact, NV. He places a rod of pure copper into the solution making a cathode and uses a graphite rod as an anode
what is the concentration of the 25.0 mL of diluted drink in the volumetric flask?
The temperature of the water was 22 Celsius and thebarometric pressure was 735.8 mm Hg. What is the vapor pressure of the water? What is the pressureof dry hydrogen gas?
If the initial pressure of the ether is 135 torr, what is its partial pressure after 1420 s? (Note, since the volume and temperature don't change, the pressure is directly related to number of moles and so the pressure can be treated similar to co..
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