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An emission line from K atoms is found to have two closely spaced components, one at 766.70nm and the other at 770.11nm. Account for this observation, and deduce what information you can.
calculate the approximate amount of sodium thiosulfate pentahydrate needed to prepare 500mL
A flask contains 0.180 of liquid bromine,. Determine the number of bromine molecules present in the flask.
When aluminum reacts with concentrated hydrochloric acid, hydrogen gas evolves. The hydrogen is collected by displacement of water at 22ºC at a total pressure of 750 torr.
Which pair is written with the first member having the higher boiling point?
A hypothetical metal has a face-centered cubic unit cell and a density of 6.12 g/cm3. The molar mass of the metal is 143.2 g/mol. What is the atomic radius of this metal?
Calculate the pH of the solute in an aqueous solution of 0.372 M (CH3)3N(aq) if the Kb is 6.5 Ã- 10âˆ'5.
Fluoride (F-) is toxic element (anion) that can be lethal at 0.20 g/70kg of body weight. But because F- at low levels (1ppm) aids in healthy teeth, municipal water sources normally add this level of fluoride.
Starting with 86.3 g NO and 25.6 g H2, find the theoretical yield of ammonia in grams
What is the value of Kc for this reaction, In glycolysis, the hydrolysis of ATP to ADP is used to drive the phosphorylation of glucose: Glucose + ATP ADP + glucose - 6 - phosphate
A laser pulse with wavelength 555nm contains 4.40mJ of energy. How many photons are in the laser pulse.
50.0 mL of 2.00 M H2SO4 react with 75.0 mL of 2.00M NaOH. Identify the limiting and excess reactants. How many grams of Na2SO4 will be formed.
what is the molarity of a solution prepared by combining 125mL of 0.251 molar HCl with 250mL of pure water
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