# Copper (I) oxide (tenorite mineral) and copper (II) oxide (cuprite mineral) are found in nature. What mass of tenorite contains

**Copper (I) oxide (tenorite mineral) and copper (II) oxide (cuprite mineral) are found in nature. What mass of tenorite contains as much copper as 160 g of cuprite?**

Given: oxide Cu2O and CuO, m (CuO) = 160 g.

Find: m (Cu2O) -?

Decision.

1. Let’s calculate the mass fraction of copper in the CuO oxide.

Mr (CuO) = Ar (Cu) + Ar (O) = 64 + 16 = 80

ω (Cu) = Ar (Cu) / Mr (CuO) = 64: 80 = 0.8

2.C from the formula for finding the mass fraction ω (Cu) = m (Cu) / m (CuO), we find the mass of the cuprum:

m (Cu) = ω (Cu) • m (CuO) = 0.8 • 160 g = 128 g.

3. Let’s calculate the mass fraction of copper in the oxide Cu2O.

Mr (Cu2O) = 2 • Ar (Cu) + Ar (O) = 2 • 64 + 16 = 144

ω (Cu) = 2 • Ar (Cu) / Mr (CuO) = 2 • 64: 144 = 0.89

2.C from the formula for finding the mass fraction ω (Cu) = m (Cu) / m (Cu2O), we find the mass of the oxide Cu2O:

m (Cu2O) = m (Cu): ω (Cu) = 128 g: 0.89 = • 160 g = 144 g.

Answer: 144 g.