Ronald P.

Consider the reaction:
4 HCl(g) + O2(g)-2 H2O(g) + 2 Cl2(g)

Each molecular diagram represents an initial mixture of the reactants. How many molecules of Cl2 would form from the reaction mixture that produces the greatest amount of products?

Write a balanced chemical equation for the reaction of solid strontium with iodine gas.

The half-life for the radioactive decay of U-238 is 4.5 billion years
and is independent of initial concentration. How long will it take
for 10% of the U-238 atoms in a sample of U-238 to decay? If a
sample of U-238 initially contained 1.5 * 1018 atoms when the
universe was formed 13.8 billion years ago, how many U-238
atoms does it contain today?

The resolution limit of a microscope is roughly equal to the wavelength of light used in producing the image. Electron microscopes use an electron beam (in place of photons) to produce much higher
resolution images, about 0.20 nm in modern instruments. Assuming that the resolution of an electron microscope is equal to the de Broglie wavelength of the electrons used, to what speed must the electrons be accelerated to obtain a resolution of 0.20 nm?

The standard free energy change for the hydrolysis of ATP was given in Problem 91. In a particular cell, the concentrations of ATP, ADP, and Pi are 0.0031 M, 0.0014 M, and 0.0048 M, respectively. Calculate the free energy change for the hydrolysis of ATP under these conditions. (Assume a temperature of 298 K.)

The values of Gf for the hydrogen halides become less negative with increasing atomic number. The Gf of HI is slightly positive. On the other hand, the trend in Sf is to become more positive with increasing atomic number. Explain.