bro can someone help me what's with no one helping in chemistry (what is the reaction of Si + S₈ --> Si₂S₄

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Areaction in which products can react to re-form reactants is

506g of hi produce how many grams of i2?