Answer : The total mass of sulfur consumed will be, 0.64 grams and the chemical formula of the compound produced is,
copper oxide.
Solution :
According to the law of conservation of mass, the total mass of reactant should be equal to the total mass of product.
The balanced chemical reaction will be,

In this reaction, copper and sulfur are the reactants and copper sulfide is the product.
Let the mass of sulfur be 'x' gram


According to the law of conservation of mass,




Therefore, the total mass of sulfur consumed will be, 0.64 grams and the chemical formula of the compound produced is,
copper oxide.