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A photocell is a device used to measure the intensity of light. In a certain experiment, when light of wavelength 630 nm is directed onto the photocell, electrons are emitted at the rate of 2.6 X 10-12 C/s (coulombs per second). Assume that each photon that impinges on the photocell emits one electron. How many photons per second are striking the photocell? How much energy per second is the photocell absorbing?
Lithium iodide has a lattice energy of and a heat of hydration of. Determine how much heat is evolved or absorbed when 40.0 of lithium iodide completely dissolves in water.
The pH at 25 °C of an aqueous solution of the sodium salt of p-cresol (NaC7H7O) is 11.60. Calculate the concentration of C7H7O- in this solution, in moles per liter. Ka for HC7H7O is equal to 6.7E-11.
At a certain temperature, Kw = 1 x 10-13. This means that pH + pOH = 13 at this temperature. Given this, what is the pOH of 0.05 M Ba(OH)2 at this temperature
Molecular orbital (MO) theory predicts the O2 +2(a +2 CHARGE) ion has a bound order of
Calculate the statistical mechanical values of Internal Energy, Entropy, Gibbs Energy, Enthalpy and Cvm for H2 (g) at 3000 K.
a boiler is used to heat steam at a brewery to be used in various applications such as heating water to brew the beer
A stock solution is prepared by adding 35 mL of 1.5 M NaNO2 to enough water to make 49 mL. How many moles of NO2- are in 30 mL of the stock solution
Explain how the formation of a soap ‘micelle' helps remove dirt and oil in an aqueous environment.
Consider air to be a mixture of 80% nitrogen and 20% oxygen.How much work is required to raise the temperature of 6 mol of air by 3 °C in an adiabatic process?
calculate the ksp of lead iodide from the following standard electrode potentials at 25 c oxidative -.126 redox
If the correct mass percentage of HC2H3O2 in the vinegar is 5.40%, why does trial 2 give the best results. What is the percent error of this trial
calculate the temperature (in EC) at which the vapor pressure is 760 torr. The vapor pressure of Ethanol is 115 torr at 34.9EC
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