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In the following experiment, a coffee-cup calorimeter containing 100. rm mL of rm H_2O is used. The initial temperature of the calorimeter is 23.0 rm ^{circ}C. If 3.70 g of rm CaCl_2 is added to the calorimeter, what will be the final temperature of the solution in the calorimeter? The heat of solution, Delta H_{rm soln}, of rm CaCl_2 is rm -82.8~kJ/mol.
adding the two portions of water into your calorimeter the temperature of the mixed portions of water to be 45 oC. determine the heat capacity of the calorimeter?
Discuss how precise and accurate measurement can be achieved in spite of the inherent measurement uncertainty. Take a ruler and measure the height of the textbook three times. Record the three measurements, and discuss the uncertainty in your meas..
A nurse administered 3.50 mL of a radioisotope solution that has an activity of 135 Ci/mL. What total dose of the radioisotope did the patient receive
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.
The half-life of a certain radioactive element is 1,250 years. What percent of the atoms remain after 7,500 years?
Using an unmanned rocket to visit the space station requires 85.2 trillion BTU of energy. The best fuel for the mission will have the highest ratio of energy to volume.
Methanol is toxic for humans if they ingest liquid methanol or inhale methanol vapor in significant quantities. When inhaled in concentration greater than 1000 ppm, death has been reported.
2 NO(g) +Cl2->2NOCL(g) the observed rate law is Rate= K(NO)^2(Cl2). What is the reaction order with respect to nitrohen monoxide with respect to Cl2? Wht id the overall order
Write the molecular, total ionic and net ionic equations summarizing the reaction between aqueous solutions of potassium chloride and silver nitrate.
Electromagnetic radiation has an energy of 926 J. The wavelength of this radiation is 856 nm. How many photons are required to generate this energy?
What kinetic energy must the electrons have in order to resolve a protein molecule that is 3.80 nm in diameter? Take the mass of an electron to be 9.11× 10-31 kg.
CaCN2 + 3 H2O → CaCO3 + 2 NH3 . How much CaCO3 is produced if 47.5 moles NH3 are produced?
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