Balancing the books of photosynthesis

A leaf fixes carbon dioxide, and the equation of photosynthesis tells you how much of everything else comes with it. You will write small functions for the glucose and the oxygen, and check where the oxygen comes from.

The idea. Six carbon dioxide molecules make one glucose molecule and release six oxygen molecules. Masses of $180\ \text{mg}$ per millimole for glucose and $32\ \text{mg}$ per millimole for oxygen are given.

Your tasks.

1. In glucose_mmol, return the millimoles of glucose made from the given millimoles of carbon dioxide.
2. In oxygen_mg, return the mass of oxygen in milligrams released by the given millimoles of carbon dioxide.
3. Set heavy_in_o2 to the number of heavy oxygen atoms in the oxygen gas when $12$ heavy water molecules are split.