# 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.