Water in crystals

Four hydrated salts are listed with the molar mass of the dry salt and the number of water molecules, $x$. You will make the program find the share of water in each, the water driven off from a sample, and the salt that is most water.

The idea. One unit of $\text{salt} \cdot x\text{H}_2\text{O}$ has $18x\ \text{g/mol}$ of water out of a total of (dry salt $+ 18x$).

Your tasks.

1. In water_share, return the percentage of water.
2. In water_lost, return the grams of water driven off from mass grams of crystals.
3. Find most_water, the name of the salt with the biggest share of water.