Question

3. The following data was obtained from a student's experiment when copper was heated with sulfur. Complete the data. Show your calculations at the bottom of the page. Mass of crucible and lid 26.98 g Mass of copper, crucible, and lid 27.239 Mass of crucible, lid, and final compound after reaction 27.299 Mass of sulfur in the compound Moles of sulfur in the compound Mass of copper Moles of copper Empirical formula of the compound formed Show work here:

Answer 1

Sulfur mass is calculated:

m S = 27.29 - 27.23 = 0.06 g

The moles are calculated:

n S = m / MM = 0.06 / 32 = 0.0019 mol

Copper mass and moles are calculated:

m Cu = 27.23 - 26.98 = 0.25 g

n Cu = 0.25 / 63.55 = 0.0039 mol

The ratio is calculated:

n Cu / n S = 0.0039 / 0.0019 = 2

The formula is Cu2S.

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