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Calculate the standard heat formation of carbon disulfide, CS2 from its elements { C (graphite + 2 S (rhombic) -----> CS2 (l) }, given that: C (graphite) + O2 (g) -----> CO2 (g) deltaHrxn= -393.5 kJ S (rhombic) + )2 (g) ----> SO2 (g) deltahrxn= -296.4 kJ CS2 (l) + 3 O2 (g) --------> CO2 (g) + 2 SO2 (g) deltahrxn= -1073.6 kJ deltaH^0 (subscript f) (CS2, l) =
Calculate the amount of of cobalt(II) nitrate hexahydrate [Co(NO3)2*6H2O] needed to prepare 50 mL of a .15 M cobalt(II) nitrate stock solution.
avogadros number is big. if you had 6.02 x 1023 dollars and could spend it at 1 billion 109 per second for your entire
The enthalpy of vaporization of water at 373 K and 1 bar is 40.7 kJ/mol and the molar heat capacities are 75.3 J/(mol K) for liquid and 33.6 J/(mol K) for gaseous water. Find the enthalpy of vaporization of water at 273 K and 1 bar.
Chlorine gas can be prepared in the laboratory by the reaction of hydrochloric acid with manganese(IV) oxide: 4HCL(aq) + MnO2(s) ----> MnCl2(aq) + 2H2O(l) + Cl2(g)
Explain the purpose of adding 6 M HCl to the aqueous layer with sodium benzoate. Draw the reaction between sodium benzoate and HCl.
What is the concentration of each species present when equilibrium is reached? b. What is the value of Kc for this reaction at 500K?
hydrogen peroxide usually comes commercially as a 30 wv aqueous solution with a density of 1.106 gml. calculate the
A 50.0 mL volume of 0.15 M HBr is titrated with 0.25 M KOH. Calculate the pH after the addition of 16.0mL of KOH.
what would happen to the molar mass of the solute if the thermometer used actually read 1.4 degrees Celsius too high?
An open flask contains .200 mol of air. Atmospheric pressure is 745 mm hg and room temperature is 68 degrees Fahrenheit. How many moles are present in the flask when the pressure is 1.10 ATM and the temperature is 33 degrees Celsius
At room temperature (about 20degree C) milk turms sour in about 64 hours. In a refrigerator at 3 degree C, milk can be stored for about three times as long before turning sour.
HCl according to the following chemical equation? MnO2+4(HCl) --> MnCl2 + Cl2 + 2(H2O)
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