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A 5.50 g sample of SiH4 and an excess of oxygen were placed in a reaction container surrounded by 2.80 kg of water. The initial temperature of the water was 17.80°C. At the end of the reaction, the temperature of the water was 45.40°C. Assume the heat was completely absorbed by the water and no heat was absorbed by the reaction container or the calorimeter or lost to the surroundings. Calculate the heat released in the reaction. The specific heat of water is 4.184 J/g·°C.
A 1-L flask is filled with 1.10 g of argon at 25 C. A sample of ethane vapor is added to the same flask until the total pressure is 1.20 atm . What is the partial pressure of argon,PAr , in the flask?
What is the pH of the solution? The K of hypochlorous acid is 3.8*10-8. Please explain how to get this using the Henderson-Hassalbach Equation.
A 24.60 mL sample of 0.185 M HNO3 requires 27.35 mL of a KOH solution for complete neutralization in an acid-base titration. What is the molarity of KOH
Write net ionic equations for the reactions that take place when aqueous solutions of the following substances are mixed. Potassium fluoride and bromic acid. Ammonium Chloride and sodium hydroxide. Sodium cyanide and ammonium bromide
Write a chemical equation representing the second ionization energy for lithium. Use e- as the symbol for an electron.
Calculate the pH of each of the following solutions. (a) 0.115 M HONH2 (Kb = 1.1 10-8)
The addition of H2 to C=C double bonds is an important reaction used in the preparation of margarine from vegetable oils.
Draw the lewis dot structure and predict the molecular and electron-domain geometries of the following ions. a) NO2- b) CO3 2- c)ClO2-
If all the energy obtained from burning 1.09 pounds of propane is used to heat water, how many kilograms of water can be heated from 23.7 degrees celsius to 48.7 degrees celsius
Indicate if you would expect a disruption of the three-dimensional structure of a protein if the following substances were added and briefly state why
irregularly shaped object if the initial volume of water was 23.0 ml and the volume rose to 54.3 ml after the object was added?
What is the minimum potential (V) required to produce both the oxidation and reduction products written above?
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