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Compute the pH at the equivalence point for the titration of 0.150 M methylamine (CH3NH2) with 0.150 M HCl. Define the Kb of methylamine is 5.0× 10-4.
An excited electron in a hydrogen atom relaxes to the n=4 level emitting light with a frequency of 1.141*10^14 Hz. In what principal quantum level did the electron begin?
How much heat is associated with the dissociation of a weak acid, NaHSO4 in water? HSO4^-+H20 >>> H3O^+ + SO4^2-? (not sure if this is a seperate part?) Is this dissociation exothermic or endothermic
a solution is made by mixing 20.0 mL 0.4 M NaCH3COO with 30.0 mL 0.4 M CH3COOH, calculate the pH? For acetic acid, Ka = 1.76 x 10-5.
Experiments show that the molecular weight of acetic acid in the vapor state (just above its boiling point) is approximately 120. Explain the discrepancy
a 5.00 g chunk of potassium is dropped into 1.00 kg water at 24 deg c. what is the final temperature of the water after
what and how much effect does this have on the measured pressures? What is the effect on the value of?
Finely divided sulfur ignites spontaneously in fluorine gas to produce sulfur hexafluoride, as in the following equation S(s) + 3F2(g) --> SF6(g)
The solubility of air in water is approximately 2.1 x 10^-3 M at 20 degrees C and 1.0 atm. Calculate the Henry's lay constant for air. Also, is the K(H) value of air approximately equal to the sum of the K(H) values of N2 and O2 because these two ..
zinc reacts with 100. ml of 6.00 m cold aqueous sulferic acid through single replacement. how many grams of zinc
The term molecular mass better suited than the term formula mass?
how many of joules of heat are needed to raise the temperature of 10.0g of aluminum from 22 degrees c if the specific
Most transduction systems for hormones and sensory stimuli that involve trimeric G proteins have in common all of the following except
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