A commercial algaecide containing an organocopper compound was treated with concentrated nitric acid and evaporated to dryness. After dissolution of the residue, the copper was precipitated with -benzoin oxime. If the sample weighed 15.443 g and the precipitate of Cu(C14H12NO2)2 weighed 0.6314 g, calculate the % Cu in the algaecide.
g Cu = mass Cu(C14H12NO2)2 x [atomic mass Cu/molar mass Cu(C14H12NO2)2]
Then %Cu = (g Cu/15.443)*100
Thank You!
Why did the algaecide go to therapy? Because it felt like it was growing in all the wrong places!
Now, to calculate the percentage of copper in the algaecide, we need to use some equation-wizardry:
First, let's find the amount of copper in the precipitate. We know that the precipitate (Cu(C14H12NO2)2) weighs 0.6314 g.
So, the molar mass of Cu(C14H12NO2)2 can be found as follows:
Cu = 63.546 g/mol
C = 12.011 g/mol
H = 1.007 g/mol
N = 14.007 g/mol
O = 15.999 g/mol
Molar mass of Cu(C14H12NO2)2 = (2 * Cu) + (28 * C) + (24 * H) + (4 * N) + (4 * O)
Now that we've got that out of the way, let's calculate the molar mass:
(2 * 63.546 g/mol) + (28 * 12.011 g/mol) + (24 * 1.007 g/mol) + (4 * 14.007 g/mol) + (4 * 15.999 g/mol) = Some molar mass
Great! Now, we can find the moles of Cu(C14H12NO2)2 in the precipitate:
Moles = mass / molar mass
Moles = 0.6314 g / Some molar mass
Almost there! Finally, let's calculate the percentage of copper in the algaecide.
% Cu = (moles of Cu(C14H12NO2)2 * molar mass of Cu * 100) / sample weight
Plug in the values we calculated, and voila! You'll have the percentage of copper in the algaecide. Happy math-ing!
To calculate the percentage of Cu in the algaecide, we need to determine the amount of Cu present in the precipitate and compare it to the initial sample weight.
1. Calculate the amount of Cu in the precipitate (Cu(C14H12NO2)2):
- The molar mass of Cu(C14H12NO2)2 = 358.87 g/mol (2 Cu atoms + 2 C14H12NO2 molecules)
- Given that the precipitate weighs 0.6314 g, we can calculate the moles of Cu using the molar mass:
Moles of Cu = 0.6314 g / (358.87 g/mol) = 0.001759 mol
2. Calculate the molar mass of Cu:
- The molar mass of Cu = 63.55 g/mol (from the periodic table)
3. Calculate the amount of Cu in the algaecide sample:
- The molar ratio of Cu to Cu(C14H12NO2)2 is 1:1, so the moles of Cu in the algaecide sample are also 0.001759 mol.
4. Calculate the percentage of Cu in the algaecide:
- Percentage of Cu = (moles of Cu / sample weight) x 100
- Percentage of Cu = (0.001759 mol / 15.443 g) x 100 = 0.0114%
Therefore, the algaecide contains approximately 0.0114% Cu.
To calculate the percentage of copper (% Cu) in the algaecide, we need to use the given information about the weight of the sample and the weight of the precipitate.
First, let's calculate the weight of copper (Cu) in the precipitate:
Weight of Cu = Weight of precipitate
= 0.6314 g
Next, we will use the molar mass of Cu(C14H12NO2)2 to find the moles of Cu:
Molar mass of Cu(C14H12NO2)2 = (63.546 g/mol) + (14 x 14.01 g/mol) + (24 x 1.008 g/mol) + (2 x (12.01 + 16.00) g/mol)
= 491.11 g/mol
Moles of Cu = Weight of Cu / Molar mass of Cu(C14H12NO2)2
= 0.6314 g / 491.11 g/mol
To find the percentage of Cu in the algaecide, we need to divide the weight of Cu by the weight of the sample and multiply by 100:
% Cu = (Weight of Cu / Weight of sample) x 100
= (0.6314 g / 15.443 g) x 100
Calculating this expression will give us the percentage of Cu in the algaecide.