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Nitrate ion (NO2)^(-1) can be analyzed by creating an acidic solution of nitrite ion and adding excess iodide (I)^(-1) ions creating NO and I2. The I2 combines with excess (I)^(-1) to create (I3)^(-1). Using starch as an indicator, the (I3)^(-1) is titrated with (S2O3)^(-2) ion creating (S4O6)^(-2) ion and (I)^(-1) ion until the blue colour disappears. If a 0.9470 g sample was analyzed for nitrite ion using 29.00 mL of a 0.3000 mol/L Na2S2O3 solution, what is the mass of nitrite ion in the 0.9470 sample?
The ^ means upperscript and numbers written to the right of the chemical element is the downscript.
When 2.0 mol of CO2(g) is placed in a 5.0-L closed container andheated to a particular temperature, the equilibrium concentration of CO2(g) is measured to be 0.039 mol/L. Use an ICE table to determine the equuilibrium concentrations of CO(g) and O..
the specific heat of silver is 0.24 J/g degree celsius. how many joules of energy are needed to warm 4.37 g of silver from 25 degree celsius to 27.5 degree celsius?
Define the term "standard solution" and discuss what is meant by "standardizing a solution". For clarification, as an example
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
A .117 gram sample of a metal reacts with hydrpchloric acid to produce 36.3mL od dry hydrogen gas. what is the equivalent weight of this metal.
At 25°C the heat of fusion of aluminum is 10.6 kJ/mol and the heat of sublimation is 326.4 kJ/mol. What is the heat of vaporization of aluminum at 25°C?
To what volume should you dilute 95mL of a 12.0M H2SO4 solution to obtain 1.80M H2SO4 solution
Atomic orbitals of carbon relative to methane in a cubic frame of reference.
It is often necessary to do calculations using scientific notation when working chemistry problems. For practice, perform each of the following calculations
The decomposition of potassium chlorate (KClO3) is used as a source of oxygen in the laboratory. How much potassium chlorate is needed to produce 20.7 mol of oxygen?
When 20 mL of a 120 mL stock solution containing 2 M BaF2 is diluted to 80 mL, what is the concentration of F- in the new solution.
An automobile tire is inflated (while cold) to a volume of 11.8 L and a 'gauge pressure' of 36.0 psig at a temperature of 12oC. Driving on a hot day, the tire warms to 65oC and its volume expands to 12.2 L.
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