Calculate the amount of substance and the mass of Al sulfide that can be obtained from Al

| September 9, 2021 | education

Calculate the amount of substance and the mass of Al sulfide that can be obtained from Al weighing 5.4 g and S weighing 16 g.

m (Al) = 5.4 g.
m (S) = 16 g.
Determine the mass of aluminum sulfite. We write down the solution.
First, we write down the equation of reactions.
2Аl + 3S = Al2S3.
We find the amount of the substance aluminum and sulfur.
n = m / M.
M (Al) = 27 g / mol.
n = 5.4 / 27 = 0.2 mol.
M (S) = 32 g / mol.
n (S) = 16/32 = 0.2 mol.
Sulfur is in short supply, so we count in the middle.
We find the amount of a substance of aluminum sulfide according to the equation of reactions.
0.2 mol S – x mol Al2S3
3 mol S – 1 mol Al2S3
X = 0.2 * 1: 3 = 0.067 mol.
m = n * M.
M (Al2S3) = 2 * 27 + 32 * 3 = 150 g / mol.
m = 150 * 0.067 = 10.05 g.
Answer: m (Al2S3) = 10.05 g; n = 0.067 mol.



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