Question

T was found that 39.8 grams of copper (ii) sulfide was formed when 31.8 grams of
copper reacted with sulfur. how many grams of sulfur were used?

Answer 1

answer:

copper + sulphur = copper sulphide

31.8 g + Sulphur = 39.8 g

sulphur = 39.8 - 31.8

sulphur = 9g

hence, 9 gram sulphur have been used