Question

Calculate the mass of Copper which could be obtained by the complete reaction of 5g Copper 2 oxide with excess hydrogen.

Answer 1

3.99 grams is the mass of the copper which would be obtained by the complete reaction of 5 grams of Copper (II) oxide with excess of hydrogen.

Given-

• Weight of Copper (II) oxide = 5 grams

Reaction is as follows-

CuO + H₂ → Cu + H₂O

1 mol           1 mol

1×79.54g     1×63.54g

Here H₂ is in excess therefore CuO is the limiting reagent so it will be fully consumed.

79.54 gram of CuO gives 63.54 gram of Cu.

Therefore 5 gram of CuO will give

= 63.54/79.54 × 5 = 3.99 gram of Cu