a watch glass and filter paper weighing 41.060g was used to collect the CuSCN precipitate in this experiment. After drying, the precipitate, watch glass and filter paper weighed 42.525g. If the sample of alloy used for the analysis weighed 1.380g, what was the percent copper in the alloy
find the net weight of the CuSCN.
of that net weight, determine the mass of the Cu. PercentCu=atomicmassCu/(molemassCuSCN)
grams Cu=massCuSCN*percentCu.
percentCu in alloy used= massCuabove/massalloy * 100
To determine the percent of copper in the alloy, we need to find the mass of the copper in the CuSCN precipitate and compare it to the mass of the sample.
1. Calculate the mass of the CuSCN precipitate:
Mass of CuSCN precipitate = mass after drying - mass of watch glass and filter paper
Mass of CuSCN precipitate = 42.525g - 41.060g
Mass of CuSCN precipitate = 1.465g
2. CuSCN contains one mole of copper per mole of compound. The molar mass of copper is 63.55g/mol. Therefore, we can find the number of moles of copper in the precipitate:
Number of moles of copper = mass of CuSCN precipitate / molar mass of copper
Number of moles of copper = 1.465g / 63.55g/mol
Number of moles of copper = 0.023 moles
3. Now, let's find the percent of copper in the alloy:
Percent Cu = (mass of copper / mass of alloy) * 100
Percent Cu = (0.023 moles * 63.55g/mol) / 1.380g * 100
Percent Cu = (1.46g / 1.380g) * 100
Percent Cu = 105.80%
Therefore, the percent copper in the alloy is approximately 105.80%.
To determine the percentage of copper in the alloy, we need to find the mass of the CuSCN precipitate formed during the experiment.
First, let's find the mass of the precipitate:
Mass of precipitate = (Mass of precipitate + watch glass + filter paper) - (Mass of watch glass + filter paper)
Mass of precipitate = 42.525g - 41.060g
Now, let's calculate the mass of the precipitate:
Mass of precipitate = 1.465g
Since the precipitate is made up of copper and other compounds, we need to find the mass of copper in the precipitate.
The molecular formula of CuSCN is CuSCN, which means it contains one copper atom. The molar mass of Cu is 63.55 g/mol.
Let's calculate the mass of copper:
Mass of copper = (Mass of precipitate) * (Molar mass of copper) / (Molar mass of CuSCN)
Mass of copper = 1.465g * 63.55g/mol / (63.55g/mol + 32.05g/mol + 58.46g/mol)
Mass of copper = 1.465g * 63.55g/mol / 154.06g/mol
Mass of copper = 0.6037g
Now, we can find the percentage of copper in the alloy:
Percentage of copper = (Mass of copper / Mass of alloy) * 100
Percentage of copper = (0.6037g / 1.380g) * 100
Percentage of copper = 43.715%
Therefore, the percent copper in the alloy is approximately 43.715%.