what is the molarity of a solution of sodium hydroxide, if 13.25 ml of this solution is required to react with 15.6 ml of 0.10 m hydrochloric acid solution?

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).

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.