GIVING 80 POINTS

CONTEXT: Little Hotties™ Adhesive Toe Warmers use chemistry to keep your feet warm while spending time outside during the winter. The warmers contain iron powder which combines with oxygen in the air. In other words the toe warmer rusts over time. This chemical reaction releases thermal energy into the environment keeping your feet warm for up to five hours. Activated charcoal and salt in the warmer ensure that iron (Fe) in the warmer combines with oxygen (O2) to form iron oxide (Fe2O3).

The temperature and mass of six toe warmers were recorded for five hours. You will be using empirical evidence from this investigation to determine the number of oxygen molecules added during this process and how this relates to the function of the toe warmers.


QUESTION: Use the mole to determine the number of oxygen molecules (O2) that were added to a specific toe warmer. A periodic table is included on the following page. Show your thinking.

(I picked 1A)