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High-purity benzoic acid (C6H5COOH; delta H rxn for combustion= -3227 KJ/mol) is used as a standard for calibrating bomb calorimeters. A 1.221-g sample burns in a calorimeter (heat capacity= 1365 J/degrees Celsius) that contains exactly 1.570 kg of water. What temperature change is observed
Calculate the concentration of the Ca2+ in ppm (or mg/L) using the correct number of significant figures assuming the 1.0 HCl has a density of 1.000 g/mL. Show these calculations clearly in your notebook and on your report form. Recall that calciu..
A biochemist wants to utilize the following oligopeptide for biochemical assays. Estimate the number of charges on this peptide at different pH conditions by considering the charge states of amino acid residues at pH 2, pH 7.4 and pH 10.
A solution containing Pt4+ is electrolyzed with a current of 4.20 A. How long will it take to plate out 65% of the platinum in 0.50 L of a 0.010 M solution of Pt4+
Draw the molecular-orbital-energy level diagram for the SO molecule and the NF molecule
caclculate the number of grams of Fe formed when 0.300kg of Fe2O3 reacts.
Consider the following reaction how many moles of oxygen are requited to produce 1.50 moles of water. Assume that there is an excess of C3H7SH present.
After all the water is evaporated from 10.0 mL of a CsCl solution, 3.75 g of CsCl remains. Express the original concentration of CsCl solution in each of the following units.
A helium balloon is filled to a volume of 2.5 L at atmospheric pressure. If the balloon is placed inside a sealed container and the pressure is reduced to 455 torr.
What is the mass of sugar in 735g of a 19.85% sugar solution?
Once, it is important that the level of the elution solvent not drop below the top of the adsorbent why? the absorbent is packed in a liquid chromatography column
dissolving one mole of a non-volatile solute in 4 moles of a volatile solvent. If the vapor pressure of the pure solvent is 20 torr, what will be the vapor pressure of the solution.
The system H2 (g) + I2 (g) ?? 2 HI(g) is at equilibrium at a ?xed temperature with a partial pressure of H2 of 0.200 atm, a partial pressure of I2 of 0.200 atm, and a partial pressure of HI of 0.100 atm.
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