a 9.56g sample of CuS is found to contain 6.35g of copper. What is the percent by mass of sulfur in this compound? Report your answer to the hundredths place

33.58%

Explanation:

Data obtained from the question include:

Mass of CuS = 9.56g

Mass of Cu = 6.35g

Mass of S = Mass of CuS - Mass and Cu

Mass of S = 9.56 - 6.35

Mass of S = 3.21g

The percentage by mass of sulphur in CuS is given by:

Mass of S/mass of CuS x 100

Percentage by mass of S = 3.21/9.56 x 100 = 33.58%