Study the balanced chemical reaction.
2Cu + O2 → 2CuO
There are 6.45 g of copper(II) oxide (CuO) produced. What amount of the product, in g, is copper?
5.15 g
8.07 g
3.23 g
1.60 g
To determine the amount of copper in grams produced from the given balanced chemical reaction, we first need to find the molar masses of copper (Cu) and copper(II) oxide (CuO).
The molar mass of copper (Cu) is 63.55 g/mol.
The molar mass of copper(II) oxide (CuO) can be calculated by adding the molar masses of copper and oxygen:
(63.55 g/mol for copper) + (16.00 g/mol for oxygen) = 79.55 g/mol.
Now, let's calculate the number of moles of copper(II) oxide (CuO) produced using the given mass:
Mass of CuO = 6.45 g
Molar mass of CuO = 79.55 g/mol
Number of moles of CuO = Mass / Molar mass
Number of moles of CuO = 6.45 g / 79.55 g/mol
Next, we need to use the coefficients from the balanced chemical reaction to determine the stoichiometry between copper(II) oxide (CuO) and copper (Cu). The stoichiometric ratio can be determined by comparing the coefficients in the balanced equation:
2Cu + O2 → 2CuO
From the balanced equation, we can see that 2 moles of copper(II) oxide (CuO) are produced for every 2 moles of copper (Cu). Therefore, the stoichiometric ratio is 1:1 between CuO and Cu.
Since the number of moles of CuO and Cu are equal, the mass of copper (Cu) produced will be the same as the mass of copper(II) oxide (CuO) used. Therefore, the mass of copper (Cu) produced is 6.45 g.
Thus, the correct answer is 6.45 g.