The heat energy that is added to the water is used to vaporize the water rather than raise its temperature.
Explanation:
The boiling point of water is 100 °C, which means that when water reaches this temperature, it will vaporize rather than rise in temperature. Under normal conditions, the temperature of water cannot rise above 100 °C.
Because 100 degrees is the boiling point, the water boils and becomes steam at that point. So the water that was higher than 100 degrees actually became steam, which is why the water in the pot is tops off at 100 degrees.
We see from the reaction side of the equation that we have 2 Li. That means we need the same number of Li on the products side. Therefore, our only option is 2.
