A. The number of mole of copper in the sample is 0.002 mole
B. The formula of the compound is Cu₂O
C. The molar mass of the compound is 143.1 g/mol
A. How do i determine the number of mole of copper?
The number of mole of copper can be obtained as follow:
- Mass of copper = 0.1271 g
- Molar mass of copper = 63.55 g/mol
- Number of mole of copper =?
Mole = mass / molar mass
Number of mole of copper = 0.1271 / 63.55
Number of mole of copper = 0.002 mole
B. How to determine the formula of the compound
The formula of the compound can be obtained as follow:
- Copper (Cu) = 0.1271 g
- Total mass = 0.1431 g
- Oxygen (O) = 0.1431 - 0.1271 = 0.016 g
- Formula =?
Divide by their molar mass
Cu = 0.1271 / 63.55 = 0.002
O = 0.016 / 16 = 0.001
Divide by the smallest
Cu = 0.002 / 0.001 = 2
O = 0.001 / 0.001 = 1
Thus, the formula of the compound is Cu₂O
C. How to dertmine the molar mass of the compound
The molar mass of the compound can be obtained as followed:
- Molar mass of Cu = 63.55 g/mol
- Molar mass of O = 16 g/mol
- Molara mass of Cu₂O =?
Molara mass of Cu₂O = (63.55 × 2) + 16
Molara mass of Cu₂O = 127.1 + 16
Molara mass of Cu₂O = 143.1 g/mol
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