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Pyrite is a mineral with formula FeS2. An impure sample of pyrite, known to be 90-95% w/w FeS2, is to be analyzed by oxidizing all the sulfur to SO4 2-, and then precipitating as BaSO4. Exactly how many grams of the sample must be taken if a minimum of 1.0 gram of BaSO4 is desired? ( stoichiometry)
Some students observe a low-boiling fraction around 40 degrees C during the simple distillation of producing t-amyl chloride from t-amyl alcohol via a unimolecular nucleophilic substitution reaction.
Determine the entropy change for heating nitrogen gas from 25 oC to 100oC under the following conditions. Cp =29.1J·K?1 ·mol?1.
Problem- What is the theoretical yield (in mol) of carbon monoxide when 2.13 mol oxygen reacts with 2.26 mol of methane to produce carbon monoxide and water
Gold forms a substitutional solid solution with silver. Compute the number of gold atoms per cubic centimeter for a silver-gold alloy that contains 44 wt% Au and 56 wt% Ag. The densities of pure gold and silver are 19.32 and 10.49 g/cm3, respectiv..
If a volume of 21.00 ml of NaOH solution is required to reach the equivalence point in titration of a weak acid, what relationship exists between pH and pKa of the acid after 9.00 ml of the NaOH solution has been added?
A 30.0- sample of this glucose solution was diluted to 0.500 . How many grams of glucose are in 100. of the final solution?
A solution of ammonia and water contains 1.40×10^25 water molecules and 5.30×10^24 ammonia molecules. How many total hydrogen atoms are in this solution?
an interference filter has an effective bandwidth of 10nm. would it be feasible to employ such a filter to isolate the
calculate the root mean square speed of Ne atom at the temperature at which their average kinetic energy is 6.97 kJ/mol. Answer should be in m/s.
A particular laser consumes 140.0 Watts of electrical power and produces a stream of 2.59×10^19 photons/second 1012nm. What is the percent efficiency of the laser in converting electrical power to light
The compound SiO2 does not exist as a discrete molecule while CO2 does. this can be explained because: a) the Si-O bond is unstable
The oxidation of gold metal by aqua regia (i.e., royal water) results in the production of nitrogen dioxide and gold(III) ion, in the primary step. Aqua regia is a dangerous mixture of 1 part nitric acid and 3-9 parts hydrochloric acid.
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