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The enthalpy of combustion of benzoic acid (C6H5COOH) which is often used to calibrate calorimeters, is -3226.7 kJ/mol. When 3.4161 g of benzoic acid was burned in a calorimeter, the temperature increased from 20.84 to 25.67C. What is the overall heat capacity of the bumb.?
Consider the titration of 50.0 mL of 0.20 M NH 3 (K b =1.8×10 ?5 ) with 0.20 M HNO 3 . Calculate the pH after addition of 50.0 mL of the titrant.
Predict the rate of change in the concentration of N2O over this time interval. In other words, what is dt [N2O]/ dt?
An inflated balloon has a volume of 0.55 L at sea level (1 atm) and is allowed to rise to a height of 6.6 km, where the pressure is about 0.40 atm.
Atoms contain protons. 2)Nuclei move out of the paths of the alpha particles. 3)Neutrons have zero charge.
The temperature of the entire system rose from 25.30 °C to 26.59 °C. Calculate the heat of reaction, in kJ, per mole of KOH(aq).
Assume you have a jar of pulverized rock to test. Create a detailed 4-step procedure describing how you expect to go about doing this.
A 18.0 L gas cylinder is filled with 6.00 moles of gas. The tank is stored at degrees celsius. What is the pressure in the tank
How long will it take for all of the strontium 90 presently on the earth to be reduced to 1/32nd of its present amount?
What mass of NaCl must be dissolved in 65.0 grams of water to lower the freezing point by 7.50 °C? The freezing point depression constant, Kfp, for water is -1.86 °C/m.
the solubility of a salt in water represents the amount of solute necessary to reach a state of equilibrium between saturated solution and undissolved
alloy sample was analyzed for its copper content iodometrically. The alloy was dissolved in hot, concentrated nitric acid and prepared for analysis
Write a balanced equation for the reaction. What volume of 0.200M MnO4- solution is needed to titrate 22.5mL of a 0.350M solution of ethanol?
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