Answer to Question #221665 in Chemistry for figgy

Question

How many grams of CuO will be formed from the decomposition of 2.1 grams of Cu(OH)

2?

Answer 1

Solution:

Balanced chemical equation:

Cu(OH)₂ → CuO + H₂O

According to the equation above: n(Cu(OH)₂) = n(CuO)

Determine the moles of Cu(OH)₂:

The molar mass of Cu(OH)₂ is 97.561 g/mol.

Therefore,

[2.1 g Cu(OH)₂] × [1 mol Cu(OH)₂ / 97.561 g Cu(OH)₂] = 0.0215 mol Cu(OH)₂

Copper(II) hydroxide and copper(II) oxide are equivalent to 1:1.

Thus, n(CuO) = n(Cu(OH)₂) = 0.0215 mol

Determine the mass of CuO:

The molar mass of CuO is 79.545 g/mol.

Therefore,

[0.0215 mol CuO] × [79.545 g CuO / 1 mol CuO] = 1.71 g CuO = 1.7 g CuO

Answer: 1.7 g of CuO will be formed.