the mass of CuSCN precipitate is 1.379g, what is the mass of copper in the precipitate?
mass Cu = fraction Cu x 1.379g.
%Cu = (atomic mass Cu/molar mass CuSCN)*100
To determine the mass of copper in the precipitate, we need to know the molar mass of CuSCN and the ratio of copper to CuSCN in the compound.
The molar mass of CuSCN can be calculated by adding up the molar masses of copper (Cu), sulfur (S), carbon (C), and nitrogen (N):
Molar mass of Cu = 63.55 g/mol
Molar mass of S = 32.07 g/mol
Molar mass of C = 12.01 g/mol
Molar mass of N = 14.01 g/mol
The molar mass of CuSCN is therefore:
Molar mass of CuSCN = (63.55 g/mol) + (32.07 g/mol) + (12.01 g/mol) + (14.01 g/mol) = 121.64 g/mol
Next, we can set up a ratio between the mass of copper and the mass of CuSCN using the molar mass ratio:
Mass of copper / molar mass of Cu = mass of CuSCN / molar mass of CuSCN
Substituting the given values:
Mass of copper / 63.55 g/mol = 1.379 g / 121.64 g/mol
Solving for the mass of copper:
Mass of copper = (1.379 g / 121.64 g/mol) * 63.55 g/mol
Calculating:
Mass of copper = 0.719 g
Therefore, the mass of copper in the precipitate is approximately 0.719 grams.
To determine the mass of copper in the CuSCN (copper thiocyanate) precipitate, we need to know the chemical formula of CuSCN and the molar mass of copper.
The chemical formula of CuSCN indicates that one copper atom (Cu), one sulfur atom (S), and one cyanide group (CN) are present. The molar mass of copper is approximately 63.55 g/mol.
To calculate the mass of copper in the precipitate, we need to convert the given mass of the precipitate (1.379g) into moles, then use the molar ratio between copper and CuSCN to find the mass of copper.
Here are the steps:
Step 1: Determine the molar mass of CuSCN:
Cu: 1 atom x 63.55 g/mol = 63.55 g/mol
S: 1 atom x (32.07 g/mol) = 32.07 g/mol
C: 1 atom x (12.01 g/mol) = 12.01 g/mol
N: 1 atom x (14.01 g/mol) = 14.01 g/mol
Total molar mass of CuSCN: 63.55 + 32.07 + 12.01 + 14.01 = 121.64 g/mol
Step 2: Convert the given mass of CuSCN precipitate to moles:
1.379 g x (1 mol / 121.64 g) = 0.01135 mol (rounded to 4 decimal places)
Step 3: Use the molar ratio between copper and CuSCN to find the mass of copper:
From the balanced chemical equation, the molar ratio of copper (Cu) to CuSCN is 1:1.
Therefore, the mass of copper in the precipitate will be:
0.01135 mol x 63.55 g/mol = 0.721g (rounded to 3 decimal places)
So, the mass of copper in the CuSCN precipitate is approximately 0.721 grams.