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Chemical cold packs contain two pouches, one containing solid ammonium nitrate and the other containing water (often dyed for no real reason). When the contents of the pouches mix, the ammonium nitrate dissolves in the water, NH4NO3(s) → NH4+(aq) + NO3-(aq) The dissolving process is endothermic. The reaction absorbs approximately 326 J/g of ammonium nitrate. To lower the temperature of 220. g of water by 20.0°C, how many grams of ammonium nitrate would you need to dissolve?
a solution to replace potassium loss contains 40. meql of k and cl-. how many moles of k and cl- are in 1.5 l of the
Using the reactions below, write out the chemical expression for the fraction of all species that would be [Sn2+] (note this form does not need to be solved for K values, just the compounds themselves).
A saturated solution of silver benzoate C6H5COOOAg has a pH of 8.5. The Ka for benzoic acid C6H5OOH, is 6.5x10-5 estimate the value of the Ksp for silver benzoate
The final temperature of a mixture of solution prepared by dissolving 2.50 gram of NaOH in 75.0 mL of water (both initially at 25 degrees C) increases to 25.5 degrees C. Is this process exothermic or endothermic. What is the enthalpy of solution o..
calcium carbonate fw 100.09 reacts with hydrofluoric acid hf to form caf2caco3s 2 hf ------gt caf2s h2ol
approximately how many grams of monosodium succinate fw 140 gmol succinic acid pk25.64 and disodium succinate fw 162
A sample of argon gas occupies a certain volume at 14 degrees C. At what temperature would the volume of the gas be three times as big? Assume the pressure stays constant.
when two grams of sodium hydroxide were dissolved in 149 grams of h2owater in a calorimeter at twenty four degree
What weight of A would be removed from a solution of 10g of A in 100mL of water by a single extraction with 100 mL of hexanes? What weight of A would be removed by four successive extraction with 25-mL portions of hexanes?
If the mixing ratio of ozone in a polluted urban atmosphere is 50ppbv, compute its concentration
What is the solubility of CaF2 in a solution that has an equilibrium concnetration of 0.01 M EDTA ^ 4- (aq)? Ksp (CaF2) = 3.9 x 10^-11 and Kf for [Ca(EDTA)]2- = 5.0 x 10^10
.134 mole of KCl and .212 mole of CaCl2 were dissolved in water, calculate total number of Cl ions in the solution
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