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Calculate the heat of a reaction if 12.5 g CaCl is dissolved in 105 g of water and the temperature decreases from 22 degrees C to 15 degrees C. Assume the specific heat of the solution is 4.184 J/g degrees C. Is the reaction endothermic or exothermic
what is the redox reaction for MnO4- + 8H+ +5Fe2+ ______ Mn2+ + 5Fe3+ + 4H2O and which ion is oxidized and which one is reduced
another part says spectra of caffeine, benzoic acid, and a mountain dew sample in 0.10 M HCl. On a graph it has the points 8.74 mg/L for benzoic acid, 1.5 dilution for mountain dew soda,
Important information about Degree of Unsaturation, Dieldrin, C12H8Cl6O, is a pentacyclic compound formerly used as an insecticide.
Find the molarity of a solution prepared by dissolving 120 g CaCl2 (MW = 111 g/mol) in 450 cm3 of solution.
How many grams of dry NH4Cl need to be added to 1.50 L of a 0.800 M solution of ammonia,NH3 , to prepare a buffer solution that has a pH
Calculate the volume of chlorine gas in liters, measured at 20 C and 762 mm Hg, required to react with this volume of seawater.
If 14.0 mL of a 0.742 M solution of barium hydroxide is mixed with 25.9 mL of a 0.724 M solution of phosphoric acid, and 1.98 g of solid barium phosphate is collected once the reaction is complete, what is the percent yield of the reaction
A 0.160 g sample of rock was found to have 2.11 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.11 × 10-6 mol of argon-40. How old was the rock? (What assumption is made about the origin of the argon-40?)
Calculate the number of moles of Cl atoms in 1.20×1024 formula~units of magnesium chloride, MgCl_2
Two solution are mixed together: a solution containing 0.00226 moles of HNO3 and a solution containing 0.00421 moles of NaOH. How much NaOH will remain after the reaction
a urine sample contains 46.5mgl-1 of ethanol. the density of ethanol is 0.79gcm-3. what is the concentration expressed
A half-cell that consists of a copper wire in 1.00 M CuNO3 solution is connected by a salt bridge to a half cell containing a 1.00 M X(II) acetate solution and an electrode of metal X. The voltage of the cell is 1.37 V, with metal X as the positiv..
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