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Calculate the change in entropy (in J/K) when 81.8 g of water is heated from 27.9 ºC to 87.8 ºC at 1 atm. (The specific heat is 4.184 J/(g-K).)
when 2 moles of mg3n2 are allowed to react with water to form ammonia gas and magnesium oxide how many moles of h2o are
what is the ph of the 0.20 M NH3/0.20 M NH4Cl buffer after the addition of 10.0 ml of 0.10M HCl to 65.0 ml of the buffer.
a .350 g sample of a biomolecule was dissolved in 15.0 g of chloroform and the freezing point depression was determined
An unknown compound has a forula of CxHyOz. You burn 0.1523 g of the compound and isolate 0.3718 g of CO2, and 0.1522 g of H2O. What is the empirical formula of the compound?
What are the advantages of the Stock system of nomenclature over the former one?
if 6.795 g of alum was produced using the method in this experiment, how many grams of hydrogen gas could theoretically have been produced
A buffer is prepared by mixing 161 mL of 0.193 M NaOH with 695 mL of 0.687 M sodium bicarbonate (NaHCO3). Given that the Ka1 of H2CO3 is 4.5 x 10-7 and the Ka2 is 4.7 x 10-11, calculate the pH of the solution.
A 4.305-gram sample of a nonelectrolyte is dissolved in 105 grams of water. The solution freezes at -1.23°C. Calculate the molecular weight of the solute. Kf for water = 1.86°C/m.
What is the molarity of a sodium chloride solution, if 6.62 g of NaCl are dissolved in enough water to make
How many molecules of acetylene (HCCH) react with 123 molecules of oxygen to produce carbon dioxide and water.
Which of the available reagent(s), if any, will oxidize Fe(s) while leaving Cu(s) unreacted? If none of the available reagents can be used for this purpose, then identify another reagent from the table that could be used. For each reagent you've i..
How many grams of Potassium Chlorate decompose to passium chloride and 638mL of O2 at 128 degrees C and 752 Torr. 2KClO3 (s) => 2KCl (s) + 3O2(g)
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