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A sample of a chromium-containing alloy weighing 3.450 g was dissolved in acid, and all the chromium in the sample was oxidized to CrO4 2-. It was then found that 3.18 g of Na2SO3 was required to reduce the CrO4 2- to CrO2 - in a basic solution, with the SO3 2- being oxidized to SO4 2-.
(a) Write a balanced equation for the reaction f CrO4 2- with SO3 2- in a basic solution.
(b) How many grams of chromium were in the alloy sample?
(c) What was the percentage by mass of chromium in the alloy?
In a particular solution, [Cr3+]=3.9x10-4 mol/L. What is the minimum pH at which Cr(OH)3(s) will precipitate from this solution. Assume the temperature is 25oC. For Cr(OH)3(s)
find the ph of the resulting solution when 20.00ml of a 0.1000m triethylamine ch3ch23n kb 5.2x10-4 solution is
Problem- Oxalic acid (H2C2O4) reacts with chromate ion in acidic solution as follows: 3H2C2O4 (aq) + 2CrO4 2- (aq) + 10 H+ (aq) = 6CO2 (g) = 2Cr3+ (aq) +8H2O (I) oxalic acid.
The size of a diamond is measured in carats. (1 carat=.200 g) The density is 3.51 g/cm3. How many carats is a diamond that measures .
If a solution containing 17.76 g of mercury(II) perchlorate is allowed to react completely with a solution containing 5.102 g of sodium sulfate.
Calculate the work done (in joules) if the gas expands against a constant pressure of 2.1atm. Enter your answer in scientific notation.
Calculate the binding energy per nucleon (in MeV) for P-32 (atomic mass = 31.9739 u). mass H = 1.007825 u and mass n = 1.008665 u.
For a silver-silver chloride electrode, the following potentials are observed- E° = 0.222 V E(saturated KCl) = 0.197 V Predict the value of E for a calomel electrode saturated with KCl, given that E° for the calomel electrode is 0.268 V
How many moles of methane are produced when 85.1moles of carbon dioxide gas react with excess hydrogen gas
would this be a good example for the formation of a fatty acid in an acidic evironment?ch3ch216co2-na hcl rarr
For 2.25 moles of an ideal gas, Pext=P=200x10^3 Pa. The temperature is changed from 122 C to 28.5C and Cv=3R/2. Calculate the q, w, delta U and delta H for an isochloric process.
Question- a) The pKa value for the carboxylic acid group in acetic acid is 4.75. Write the predominant structure of acetic acid at (a) pH=1, (b) pH=7, (c) pH=13. b) Write the predominant structure of glycylglycine at (a) pH=1.5 (the approximate pH..
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