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How much energy (in kilojoules) is released when 12.8 g of steam at 124.5 degree celcius is condensed to give liquid water at 79.5 degree celcius? The heat of vaporization of liquid water is 40.67 kJ/mol , and the molar heat capacity is 75.3 J/(K*mol) for the liquid and 33.6 J/(K*mol) for the vapor.
if anbsp nonvolatile yellow crystalline solid sample of 0.351 g is dissolved in benzene c6h6 of 15.8 g formed a
If a temperature increase from 22.0 degrees Celsius to 33.0 degrees Celsius triples the rate constant for a reaction, what is the value of the activation barrier for the reaction
A syringe containing 1.64mL of oxygen gas is cooled from 95.9°C to 0.8°C. What is the final volume of oxygen gas?
What is the concentration of a solution prepared by dissolving 125 g cholesterol in hexane to a final volume of 685 mL?
What is the mass percent composition of oxygen in a compound having the empirical formula C20H40O1?
A buffer solution is 0.10 M HAc (acetic acid) and 0.10 M NaAc (sodium acetate) and we have 1.000 Liter of it. What is the pH after 0.010 moles of HCl are added to this solution
Barium sulfate is a very insoluble compound. Please give reasons for compounds like barium sulfate or barium phosphate to be insoluble
it takes 261 kj/mol to eject electrons from a certain metal surface. what is the longest wavelenght of light(nm) that can be use to eject electrons from the surface of this metal via the photoelectric effect?
Suppose 1500 J of heat energy are put into a sample of liquid water at 25 degrees celsius, and the final temperature of the water is 75 degrees celsius. How many grams of water are present?
three gases nitrogen helium and krypton are confined in a 4.00 l vessel at a pressure of 14.0 atm. the vessel contains
The Kp for the reaction is 4.3X10^-4 at 648K. Determine the equilibrium partial pressure of NH3 in a reaction vessel that initially contained 0.900atm N2 and 0.500 atm H2 at 648K.
A 12-gram mixture of methane, CH4, and ethane, C2H6, is completely combusted in oxygen. If the total mass of H2O produced is 23.4 grams, what was the approximate mass of the methane in the original mixture
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