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100 g of ice at 0 C is melted, heated to 100 C and vaporized at that temperature. These changes are brought about by a heater that supplies heat at a constant rate of 1000 W. Sketch graphs showing a) the temperature vs. time b) the enthalpy vs. time c) Enthalpy vs. temperature for this process. Mark the salient features.
Process occurs at constant pressure of 1 bar. Assume that heat capacity of the liquid remains constant in the temperature range explored.
Heat evolved per mole of Mg 6) Change in enthalpy for the following specific reaction. Be sure to indicate the correct sign (- or +) for the change in enthalpy. Mg(s) + 2H(aq)===>Mg(aq)+H2(g)
Light with a frequency of 7.11 x 10 -14 Hz lies in the violet region of the visible spectrum. What is the wavelength of this frequency of light? Answer in units of nm.
Three gases, nitrogen, helium, and krypton are confined in a 9.00 L vessel at a pressure of 7.00 atm. The vessel contains 5.00 moles of nitrogen, 2.00 moles of helium, and 2.00 moles of krypton. What is the partial pressure of helium
The boiling point of propylamine, CH3CH2CH2NH3, is 48 °C while that for its isomer trimethylamine, (CH3)3N, is only 3 °C. Explain the difference on the basis of the intermolecular forces
The pKa's of benzoic acid and 4-nitroanilinium hydrochloride are 4.2 and 1.0, respectively.
How many molecules of water are produced when 143 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water.
According to quantum mechanics, the energy levels for an particle with mass m (such as an electron) confined in a 1-dimensional box of length a is given by
2 g of a hydrocarbon fuel is burned in a colrimeter that contains 250 grams of water initially at 25 degrees celcius. After the combustion, the temperature is 26.55 degrees celcius.
One hundred grams of water is saturated with NH4Cl at 50 degrees celsius . According to Table G, if the temperature is lowered to 10 degrees celsius, what is the total amount of NH4Cl that will precipitate.
How long would a current of 100.0 amp need to be passed through a Al 3+ solution in an electrolysis cell to produce 40.0 g of aluminum metal? Al = 26.98 g/mol F = 96485 C/mol
Equal initial pressures of hydrogen and nitrogen are added to a container at 298K where they react as in question 1. (question 1 is at the end) a. If the equilibrium pressure of hydrogen is 1.5 atm, determine the equilibrium pressures of nitrogen a..
What is the enthalpy change corresponding to the melting of 2.5 moles of H2O? What is the system? What is the surrounding?
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