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Explain an 0.6325 g sample containing Ba2+ and Ca2+ was precipitated to form BaC2O4*H2O and CaC2O4*H2O. Explain the oxalates were heated in a TGA leaving a residue of 0.5713 g in the range of 320-400°C and 0.4673 g in the range of 580-620°C. Compute the % Ca and Ba in the sample.
0.25 g of hydrogen chloride HCl is dissolved in water to make 8.0 L of solution. What is the pH of the resulting hydrochloric acid solution?
Find the absolute and percent relative uncertainty and express each answer with a reasonable amount of significant figures. 5.1(+-0.3) - 3.7(+-0.2) Need Numeric Result, Absolute Error, and Relative Error
Calculate the hydronium concentration for a solution prepared by dissolving 0.15 mol of benzoic acid (C6H5COOH) and 0.30 mol of sodium benzoate (C6H5COONa) in 1.00 L of solution. (Ka of C6H5COOH = 6.5 x 10-5)
A rectangular beam made using concrete with f'c = 6000 psi and steel with fy=60000 psi has a width b= 20 in. The concrete modulus of rupture fr=530 psi. The elastic moduli of the concrete and steel are, respectively,
Calculate the pH if .2 mol HCl is added to.5 L of a butter solution that is .28 M NH3 and .22 M NH4CL. For NH3, the Kb=1.8x10^-5
If it took 8.54 mL of .150 M lead (ii) nitrate what is the mass of chloride in the ointment? What is the mass of Chloromycetin? What is the percent chloromycetin in the solution?
A compressed-air tank carried by scuba divers has a volume of 6.80L and a pressure of 120atm at 20 degrees celsius. What is the volume of air in the tank at 0 degrees celsius and 1.00atm pressure (STP)
the density of gold is 19.31 gcm3 and the density of platinum is 21.43 gcm3. if equal masses of gold and platinum are
Vein material consisting of quartz (G=4.48 g/cc) and Barite (g=4.48 g/cc) has a density of 3.60 g/cc. What is the wt % of barite in the vein. What is the wt % of Ba
what is the volume of a sample of helium that has a mass of 6.36 times 10-3 g and a density of 0.17847 gl? answer in
13When heated in a flame, sodium atoms emit light with a frequency of 5.09 × 1014 s-1. What is the wavelength of this radiation in nm? [Data: c = 2.998 x 108 m/s ]
What is the value of the equilibrium constant at 25 degrees C for a reaction, if the value of ?G°rxn is -47.8 kJ at 25 degrees C
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