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What is the relative concentration of propanoate (Ka=1.34E-5) at pH=5.000?
if the syinge colume had been incorrectly read, giving a calculated system volume of 25.6 mL, what would have been the percent error in the calculated value of R?
Decribe the preparation of the 100mL of a 50 mM acetate buffer at pH 5.5 beginning iwth sodium acetate and 1M acetic acid
There are 2.60*10^15 short tons of oxygen in the atmosphere {1short ton = 2000 lb). Explain how many metric tons of oxygen are present (1metric ton = 1000Kg).
The half-life for the radioactive decay of [U]-238 is 4.5 billion years and is independent of initial concentration. Part A How long will it take for 20% of the [U]-238 atoms in a sample of [U]-238 to decay?
so3 can be produced in the following two-step processfes2 o2 ---gt fe2o3 so2 s02 o2 ----gt so3assuming that all the
One oxide of iron is fund to consist of 22.36% oxygen by mass. Which of the following represents possible mass percent oxygen of a second iron oxide. Explain.
a gas sample has a volume of .150 L at a temperature of 256 K. What volume will the gas occupy at 288K?
A fossil was analyzed and determined to have a carbon-14 level that is 50% that of living organisms. The half-life of C-14 is 5730 years. How old is the fossil?
Citric acid is a triprotic acid with pKa1=3.15; pKa2=4.77; pKa3=5.19. Calculate the concentrations of all species in solution.
An electron drop to what energy level is likely to emit a photon of red light?the secondthe firstthe third
The blue color of the sky is due to the scattering of sunlight by the molecules in the air. The blue light has a frequency of about 7.5 x 10^14 Hz.
Calculate the pH of 23.5 mL of a .165 M aqueous NH3 solution after the addition of 21.7 mL of .100 M HCL. The kb for NH3 is 1.8x10(-5)
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