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The rate constant for the second order reaction 2NO2 ???&??; N2O4 is 2.79 L/mol •min at 48 oC. If the initial concentration of NO2 is 1.05 M , what is the half-life?
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Vinegar is an aqueous solution of acetic acid CH3OOH. A10 mL sample of a particular vinegar requires 31.45 mL of 0.2560 Mof KOH for its titration. What is the molarity of acetic acid in vinegar?
A student finds that the mass of an object is 6.62 kg. She is told that her measurement has an error of 12.3%. What is the true mass (in kg) of the object?
A sealed vessel contains a gaseous mixture of H2 and excess O2. The mixture is at 500 K and has a total pressure of 140 kPa. After all of the hydrogen is reacted, the total pressure of the system measured at the same tem ...
The common charges of an element can be related to the electron configuration of the element. Why would copper ions have 2 common charges? Explain each of them in terms of the electron configuration.
15 grams of NaCl is dissolved completely in a beaker containing 200mL of water. What is the Na+ concentration in moles/liter in the final solution?
A sample consisting of 1.0 mol CaCO3(s) was heated to 800 °C, when it decomposed. The heating was carried out in a container fitted with a piston that was initially resting on the solid. Calculate the work done during co ...
What is the molarity, to the hundredths place, of 5.0 g HPO3 in 300. mL of solution?
The combustion of naphthalene (C 10 H 8 ), which releases 5150.1 kJ/mol, is often used to calibrate calorimeters. A 1.05 - g sample of naphthalene is burned in a calorimeter, producting a temperature rise of 3.86 degrees ...
Calculate the dissociation constant of NH4OH(aq) if the degree of dissociation of 0.006 mol/kg solution is 0.053 and the activity coefficients of all species equal 1.
A photon of wavelength 200 nm strikes the surface of a metal causing an electron to be ejected with kinetic energy of 4.3 x 10-19 J. What was the threshold frequency of the metal?
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