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In a clock reaction 20.0mL of 0.200M KI, 20.0mL of 0.100M (NH4)2S2O8 and 10.0mL of 0.00500M Na2S2O3 were mixed in the presence of a starch solution indicator. The solution turned blue in 63.9 seconds.
a. Explain what were the initial molar concentrations of (I)- , (S2O8)2- and (S2O3)2- in the reaction mixture?
b. Explain what percent of the (S2O8)2- has reacted when the mixture turned blue?
using a sample of a compound containing only oxygen and chlorine reacts with an excess of h2 gas to give 0.206 g
Peroxydisulfate ion oxidizes iodide ion to triiodide ion, I3, The reaction is S2O82- (aq) + 3I- (aq) --> 2SO42- (aq) + I3- (aq). How is the rate of reaction that is expressed as the rate of formation of I3- related to the rate of disappearance of ..
Many power plants produce energy by burning carbon-based fuels, which also produces carbon dioxide. Carbon dioxide is a greenhouse gas, so over-production can have negative effects on the environment. Use enthalpy of formation data to calculate th..
In the following reaction, Zn (s) + CuSO4 (aq) ? ZnSO4 (aq) + Cu (s) What is the reducing agent and what is the oxidixing agent
consider two separate 1 litre vessels connected via a small tap which is initially closed. the first vessel contains
What is the pH of concentrated sodium hydroxide? NaOH FW=40.0 g/mol
A solution of potassium permaganate is standardized with iron metal, a primary standard. The iron is dissolved in acid, reduced to Fe(II), and titrated with permanganate.
The pH after adding 10. mL of .10 M NaOH is 4.31. Calculate the total volume of .10 M NaOH that the buffered sample can absorb
While 250 mg of eugenol the compound responsible for the odor of oil of cloves, was added 100 g of camphor it lowered the freezing temperature by 0.62 K. Compute the molar mass of eugenol.
The standard free energy of activation of a reaction A is 73.9kJ/mol-1 (17.7 kcal mol-1) at 298 K. Reaction B is one million times faster than reaction A at the same temperature. The products of each reaction are 10.0 kJ mol-1 (2.39 kcal mol-1) mo..
burning 480 cm3 of propane measured at r.t.p,caused the temperture of 250 cm3 of water to increase by 42.5 celsius. calculate the heat of combustion of propane.
You have a sample of bone collected from Nevada and you find that it contains strontium-90 and exhibits an activity of 2.5 Bq. How much strontium-90 was present in the bone when the animal died 45 years ago?(The half-life of 90Sr is 29 years.)
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