When a 10 g sample of copper oxide is reduced by heating in the presence of carbon monoxide, how many moles of copper are formed?
Which copper oxide; ie., CuO or Cu2O.
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To determine the number of moles of copper formed when a 10 g sample of copper oxide is reduced, we need to follow a few steps.
Step 1: Calculate the molar mass of copper oxide.
The molar mass of copper oxide is the sum of the atomic masses of copper and oxygen. The atomic mass of copper (Cu) is 63.55 g/mol, and the atomic mass of oxygen (O) is 16.00 g/mol. Copper oxide (CuO) has one copper atom and one oxygen atom, so the molar mass is:
(1 x 63.55 g/mol) + (1 x 16.00 g/mol) = 79.55 g/mol
Step 2: Determine the number of moles of copper oxide in the 10 g sample.
To find the number of moles, we divide the mass of the sample by the molar mass of copper oxide:
Number of moles = Mass / Molar mass
Number of moles = 10 g / 79.55 g/mol = 0.126 mol
Step 3: Since the copper oxide is reduced, the number of moles of copper formed will be the same as the number of moles of copper oxide initially present.
Therefore, 0.126 moles of copper will be formed.
In conclusion, when a 10 g sample of copper oxide is reduced by heating in the presence of carbon monoxide, 0.126 moles of copper will be formed.