Question

1) Calculate mass of copper() sulfide (Cu :S) s formed when you react o.650 alculate mass of copper() sulfide (Cu S) s formed when you react you react 0.650 g of copper ur ().Also calculate mass of sulfur in copper(1) sulfide formed.(C) with excess of sulfur (b). Also calculate mass of sulfur in copper a) Show balanced equation for the reaction below b) Show calculation steps with conversion factors and answer with calculator value (c. v.) and final value (f.v.). c) Calculate the mass of element sulfur (S) in copper (1) sulfide formed in q b.

Answer 1

1) a) the reaction will be

2Cu(s) + S --> Cu2S

b) When one mole of copper reacts with with half mole fo sulphur we obtain one mole of copper sulphide

Atomic weight of copper = 63.5 grams

Mol weight of copper sulphide = 159 grams

so, 63.5 grams will give 159 grams of copper sulphide

So 0.65 grams will give 159 X 0.65 / 63.5 = 1.62 grams of copper sulphide

c) The mass of sulphur in 159 grams of copper sulphide is 63.5 grams

so mass of sulphur in 1.62 grams = 0.646 grams of sulphur