The maximum water vapor that air can hold at 30°c is about 30 grams/cubic meter. if the humidity of the air is currently 6 grams/cubic meter at the same temperature, the relative humidity is %.

20%

Explanation: Relative humidity is the ratio of amount of moisture in the air to the maximum amount of moisture that could exist in the air at a specific temperature.

Thus

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).