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If a 45.6-g sample that is 98.5% K2Cr2O7 by mass is allowed to react with 305 ml of HCl with a density of 1.15 g/ml and 30.1 % by mass, how many grams of Cl2 are produced?
glass is a notorious source of metal ion contamination. three glassbottles were crushed and sieved to collect 1-mm
An industrial wastewater contains 2000 mg/L of total Ammonia as N, 490 mg/L of total Ni and has no inorganic carbon. The PH = 2.8. Using the diagram calculate to what pH the waste must be adjusted to so that the total Ni concentration is 1 mg/L.
Kp for the reaction of SO2(g) with O2 to produce SO3(g) is 3 × 1024 . Calculate Kc for this equilibrium at 25ºC. (The relevant reaction is 2SO2(g) + O2(g) 2SO3(g).)
Olympic cyclists fill their tires with helium to make them lighter. A cyclist filled her bicycle tire, which has a volume of 855 mL, to a pressure of 8.5 atm at 25 C with helium.
a compound is 40.0 c 6.70 h and 53.3 o by mass. assume that we have a 100 g sample of this compound. the molecular
a melting point determination of vanillin melting point 80 c was made with a heating apparatus setting at the maximum
Explain why evaporation is a cooling process. Relate average kinetic energy to temperature in your answer
The free energy change of the conversion of tasmainium to bulgarium was - 60 kcal and the enthalpy of the reaction was determined to be - 9.2kcal.
A powder contains FeSO4·7H2O (molar mass = 278.01 g/mol) among other components. A 3.585-g sample of the powder was dissolved in HNO3 and heated to convert all iron to Fe3
The average atomic mass recorded on the periodic table for cobalt is 58.933 u. This indicates that the most abundant isotope of cobalt is. A newly discovered element, X, has two naturally occurring isotopes. 93.5 percent of the sample is an isotop..
A 14 mL sample of a solution of AlBr3 was diluted with water to 56 mL. A 25 mL sample of the dilute solution was found to contain 2.31 M Br-. What was the concentration of AlBr3 in the original undiluted solution
A weak acid HA (pKa = 5.00) was titrated with 1.00 M KOH. The acid solution had a volume of 100.0 mL and a molarity of 0.100 M. Find the pH at Vb = 0 mL, Vb = 10.1 mL and Vb = 12.0 mL
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