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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)
The amount of carbon-14 in ancient artifacts and fossils is often used to establish their age. Determine the number of protons and neutrons in a carbon-14 isotope and write its symbol in the form
Draft the pH curve for the titration of 20.0mL of a 0.150M solution of a weak acid, HA (Ka=5.4x10-6) with 0.150M KOH. Indicate the pH at: a) the beginning of the titration 0.0mL, b) after adding 10mL, c) 20mL, and d) 30mL of the titrant.
how many moles of ethylene glycol should be added to the radiator to lower the freezing point of the water from 0
The protein in a 1.285-g sample of an oat cereal is determined by the Kjeldahl procedure for organic nitrogen. The sample is digested with H2SO4, the resulting solution made basic with NaOH
Question- As a technician in a large pharmaceutical research firm, you need to produce 200.mL of 1.00 M potassium phosphate buffer solution of pH = 6.94. The pKa of H2PO4 is 7.21. You have the following supplies: 2.00 L of 1.00 M KH2PO4 stock solu..
the pain reliever phenacetin is soluble in cold water to the extent of 1.0 g 1310 ml and soluble in diethyl ether to
Balance the following redox equation in acid: VO2^+(aq) +Zn(s) --->VO^2+(aq)+Zn^2+(aq)
Aluminum oxide, Al2O3 (molar mass = 101.96), occurs in nature as a mineral called corundum which is noted for its hardness and resistance to attack by acids. Its density is 3.97 g/cm3. Calculate the number of atoms of aluminum in 15.00 cm3 of coru..
Which of the following has the highest number of Calories?
Problem- What is the pH of a solution that is made by mixing together 100.0mL of 0.083 M nitrous acid with 50.0mL of 0.10 M sodium nitrite
Draw the Lewis structure for each including formal charges and describe in paragraph format how you went about solving the problem and making sure the answer was correct.
Calculate the pH of a solution formed by mixing 250 mL of 0.150 M NaHCO3 with 250 mL of 0.100 M Na2CO3. What is the molarity of the prepared buffer?
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