Label the dimensional analysis according to the stoichiometry problem: 12.2 mol of C5H6 combusts to form CO2 and H2O, how many moles of Oxygen used? 2C5H6 + 13O2 → 6H2O + 10CO2

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

What is the percent by mass of oxygen in fe2o3