NaClo3→
what is the reactant?

NaClo3 is the reactant here.

Explanation:

In any chemical reaction there is reactant and product. The one that takes part in chemical reaction is called as reactant. For example:

In the reaction below:

                        ----------------------> 2

Here       and are reactant, they take part in chemical reaction to form water as a product.

So the left hand side in a reaction equation always denotes the reactants. As in our question NaClo3 is in the left part of the reaction, it is the reactant.

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.