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A styrofoam cup calorimeter is used to determine the heat of reaction for the dissolution of an ionic compound in water. When 2.70 g of this compound is added to 250.0 mL of water, the temperature rises from 23.2°C to 28.8°C. Calculate the heat of reaction (qrxn = ?Hrxn) per gram of compound (in kJ/g).
Calculate the volume of carbon dioxide at 20.0 degrees C and 0.910 atm produced from the complete combustion of 5.00 methane. Compare your result with the volume of CO2 produced from the complete combustion of 5.00 kg of propane (C3H8).
calculate the molarity of h3o in a solution with oh-1.00x10-8 moll. is the solution acidic basic or
you have prepared a saturated solution of x at 20c using 27.0 g of water. how much more solute can be dissolved if the
the space shuttle orbiter utilizes the oxidation of methyl hydrazine by dinitrogen tetroxide for propulsion.4 n2h3ch3l
The wind speed is 4.8 m/s on a slightly sunny morning and plume rise is 20 m. (a) Calculate the ground-level centerline concentration 2.0 km downwind from the stack. (b) Calculate the concentration at 100 m off the centerline at the same x distanc..
Give some values of pressure and temperature at which you are sure that the substance called zinc exists in an equilibrium state as a) solid and b) vapor
The valence shell of the element X contains 2 electrons in a 5s subshell. Below that shell, element X has a partially filled 4d subshell. What type of element is X?
What is the conjugate base of each of the above? d. Write the reaction for the conjugate base interacting with water. e. Write the Kb expressions for the reaction that involves the conjugate and calculate the actual value.
The activity of the mixed sample was found to be 4.35 x 107 dpm for a sample of 0.125 mg of Pu. Calculate the weight % of each Pu isotope present.
Calculate the pH of a buffer solution that contains 0.25 M benzoic acid (C6H5CO2H) and 0.15 M sodium benzoate (C6H5COONa). [Ka = 6.5 ? 10-5 for benzoic acid]
A tank containing carbon dioxide at 400K and 50 bar is vented until the temperature in the tank falls to 300K. Assuming there is no heat transfer between the gas and the tank
When the temperature is 100 °C, find the mole fraction of benzene in the vapor and liquid phases and the ratio of total moles in vapor to total moles in liquid.
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