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A sample of iron was heated to 125.0 degrees Celsius, then placed into 375 g of water at 19.8 degrees Celsius. The temperature of the water rose to 25.6 degrees Celsius. How many grams of iron were in the sample?
What is the pressure in a 65.0L cylinder filled with 0.235 moles of nitrogen gas at a temperature of 105K.
A voltaic cell consists of an Mn/Mn2+ half-cell and a Pb/Pb2+ half-cell. Calculate [Pb2+] when [Mn2+] is 2.7 M and Ecell = 0.37 V.
A student performs a series of calorimetry experiments. She determines the calorimeter constant (Ccal) for her coffee cup calorimeter. She pours a 50.0 mL sample of water at 345 K into the calorimeter containing a 50.0 mL sample of water at 298 K.
What is the molarity of a potassium triiodide solution, KI3(aq), if 30.00 mL of the solution is required to completely react with 25.00 mL of a 0.500 M thiosulfate solution, K2S2O3(aq)
Vanillin, the dominant flavoring in vanilla, contains C, H, and O. When 1.05 g of this substance is completely combusted, 2.43 g of CO2 and 0.50 g of H20 are produced. What is the empirical formula of vanillin?
Utilize the atomic radius (70 pm) and density of neon at 25 C and 1 atm (.90 g/mL) to Compute the average density of a neon atom
a container has a mass of 78.91 grams when empty and 92.44 g when filled with water. the density of water is 1.000
A testing facility found that 8.35*10^23 molecules of carbon dioxide were produced when a sample of octane was burned in air. If this combustion process is known to produce an 86.7% yield, how many grams of octane were in the sample?
Explain what is the longest wavelength of light that will eject electrons from this metal when the binding energy 2.76E-18J
Determine the molar amounts of NO, O2 and NO2 after a complete reaction. NO=? O2=? NO2=?
Briefly explain the role played by the phase transfercatalyst in the oxidation Reaction performed on acetophenone. Explain why the reaction mixture was cooledbefore addition of the sodium metabisulfite
molecules can be as small as a few atoms or as large as thousands of atoms. in 1962 max f. perutz and john c. kendrew
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