Pure copper reacted with oxygen when heated to form a copper oxide product. Answ

Question

Pure copper reacted with oxygen when heated to form a copper oxide product. Answer the following questions and determine the formula in the form of CuxOy, of the copper oxide product. The following data were collected: Mass of copper: 24.999 g Mass of copper oxide product: 31.293 g

a. Calculate mol Cu in the copper oxide product, CuxOy

b. Calculate the mass of the oxygen gained

c. Calculate the moles of O in CuxOy

d. Calculate the mole ratio of Cu to O in CuxOy

e. What is the formula of the copper oxide?

f. What is the balanced equation for the above reaction between copper and oxygen?

Explanation / Answer

(a) Mass of Cu = 24.999 g

Moles of Cu = mass/molar mass of Cu

= 24.999/63.546 = 0.3934 mol


(b) Mass of O = Mass of copper oxide - mass of Cu

= 31.293 - 24.999 = 6.294 g


(c) Moles of O = mass/molar mass of O

= 6.294/16.00 = 0.3934 mol


(d) Mole ratio of Cu : O = 0.3934 : 0.3934 = 1 : 1


(e) Formula: CuO


(f) Balanced equation: 2 Cu + O2 => 2 CuO

or including states: 2 Cu(s) + O2(g) => 2 CuO(s)

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