Answer:
![Y=48.6\%](https://tex.z-dn.net/?f=Y%3D48.6%5C%25)
Explanation:
Hello,
In this case, we can consider the following chemical reaction for the oxidation of copper which only occurs at high temperatures:
![2Cu+O_2\rightarrow 2CuO](https://tex.z-dn.net/?f=2Cu%2BO_2%5Crightarrow%202CuO)
In such a way, for 0.032 grams of copper, the following grams of copper (II) oxide (black product) are yielded:
![m_{CuO}=0.032gCu*\frac{1molCu}{63.546gCu} *\frac{2molCuO}{2molCu}*\frac{79.546gCuO}{1molCuO} =0.078gCuO](https://tex.z-dn.net/?f=m_%7BCuO%7D%3D0.032gCu%2A%5Cfrac%7B1molCu%7D%7B63.546gCu%7D%20%2A%5Cfrac%7B2molCuO%7D%7B2molCu%7D%2A%5Cfrac%7B79.546gCuO%7D%7B1molCuO%7D%20%20%3D0.078gCuO)
Therefore, the percent yield is:
![Y=\frac{0.038g}{0.078g}*100\%\\ \\Y=48.6\%](https://tex.z-dn.net/?f=Y%3D%5Cfrac%7B0.038g%7D%7B0.078g%7D%2A100%5C%25%5C%5C%20%5C%5CY%3D48.6%5C%25)
Best regards.
For the next one I think is 4 add to 30 + 8 equals really 50
I can’t see the image of you were trying to put one
Answer:
A , 210.3 g
Explanation:
Given data:
Number of moles of SiO₂ = 3.50 mol
Mass of SiO₂ = ?
Solution:
Formula:
Number of moles = mass/molar mass
Molar mass of SiO₂ = 60.08 g/mol
by putting values,
3.50 mol = mass/60.08 g/mol
Mass = 3.50 mol × 60.08 g/mol
Mass = 210.3 g