El interrogativo qué se usa con sentido equivalente a cuánto con sustantivos no contables que designan magnitudes: En cambio, qué, escrita con acento diacrítico, se emplea para introducir enunciados interrogativos o exclamativos. Precede a la palabra a que se refiere:
While qué is an interrogative pronoun used in questions, lo que is a relative pronoun used in statements. Lo que means “what” but it may be beneficial to think of it as meaning “that which”: How to tell the difference between que and qué in spanish?