Question

The ionization energy of a certain element is 472 kJ/mol. However, when the atoms of this element are in the first excited state, the ionization energy is only 166 kJ/mol.

Based on this information, calculate the wavelength of light emitted in a transition from the first excited state to the ground state.

Answer 1

The energy should be 473-166 kJ/mol. I would then convert that to J/atom (use Avogadro's number), then E = hc/wavelength. Solve for wavelength. Check my thinking.

Answer 2

Identify the limiting reagent and the excess reagent for the reaction of 1.567 g of
sodium carbonate with 40.0 mL of 0.50M hydrochloric acid? What is the mass of
carbon dioxide produced in the above reaction? Sodium chloride and water are the
other products

Answer 3

if a bullet travels at 919.0 m/s what is it speed in miles per hour?