Ronald P.

During photosynthesis, plants use energy from sunlight to form glucose (C6H12O6) and oxygen from carbon dioxide and water. Write a balanced equation for photosynthesis and calculate Hrxn.

At least two different numbers of electron groups can result in a linear molecule. What are they? What are the numbers of bonding groups and lone pairs in each case? Provide an example of a linear molecule in each case.

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?

Determine the energy of 1 mol of photons for each kind of light. (Assume three significant figures.)

a. infrared radiation (1500 nm)
b. visible light (500 nm)
c. ultraviolet radiation (150 nm)