There's been an explosion on the command module of the Apollo 13 lunar landing mission. You need to determine whether the lunar module can safely return the astronauts to Earth.
![A spacecraft in space with Earth in the background and an astronaut exiting from a hatch. Image credit to NASA from https://www.nasa.gov/centers/marshall/history/this-week-in-nasa-history-apollo-9-splashes-down-march-13-1969.html.](/pbl/sites/files/pbl/styles/full_width_m/public/shared/apollo_13_thumbnail.jpg.webp?itok=OraEexhY)
Problem written by: Dragos Bora.
Curriculum items covered: balancing reactions, stoichiometry, mole calculations.