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The "roasting" of 48.7 g of ZnS at constant pressure gives off 220. kJ of heat. Calculate the DH for this reaction. 2ZnS(s) + 3O2(g) ® 2ZnO(s) + 2SO2(g)
To this was added 20.0 ml of DI water making to the total volume 30.0 ml. The concetration of the unknown acid was 0.868 M. What was the concentration of the original acid?
Substance A has a greater molar mass than substance B. Both are nonelectrolytes. if 50 g of substance A are dissolved in 250 g of water in one beaker
The solvent for an organic reaction is prepared by mixing 60.0 mL of acetone with 45.0 mL of ethyl acetate. This mixture is stored at 25.0C. The vapor pressure and the densities for the two pure components at 25.0C. What is the vapor pressure of t..
Lime, CaO, is produced by reaction CaCO3(s) CaO(s) + CO2(g). What weight of CaO is obtained by the decomposition of 38.7g of CaCO3.
What volume of 3.00 M NaOH must you add to the acetic acid to achieve a buffer with a pH of 5.00 at a final volume of 500 mL? (Ignore activity coefficients.)
You are given an unknown sample that when treated with hydrochloric acid forms a precipitate. After decantation, you add boiling water to the solid. All of the solid disappears.
NaOH solution were necessary to reach the equivalence point, what is the concentration of the NaOH solution? (Make sure to report the correct number of significant figures?
An experiment shows that a 115 -,mL gas sample has a mass of 0.170 g at a pressure of 711 mm; Hg and a temperature of 33Celcius. What is the molar mass?
Construct a buffer to have a pH of 7.70 using HClO and NaClO (Ka = 3 x 10-8). How many grams of NaClO must be added to 1.0 L of a 0.40 M HClO solution
Write the cell diagram for a galvanic cell consisting of a tin electrode in contact with 0.0100M tin(II) chloride solution and a chromium electrode in contact with a 0.50M chromium (III) nitrate solution.
A formate buffer (pka = 3.75) is prepared by mixing 50 mL of a 4 M formic acid and 2 g of solid sodium hydroxide (MW= 40g/mol) in total volume of 1.0 L. A peptide with the amino acid sequence C-P=T-Y-R-L-D-Q (MW = 995.12 g/mol) is dissolved in thi..
When carbon is burned in air, it reacts with oxygen to form carbon dioxide. When 27.6 g of carbon were burned in the presence of 87.2 g of oxygen, 13.6 g of oxygen remained unreacted. What mass of carbon dioxide was produced?
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