Determine how many grams of aluminum oxide will be obtained by burning 40 g of lead containing 18% impurities in oxygen?
July 28, 2021 | education|
Elemental aluminum reacts with oxygen gas to form alumina. The reaction is described by the following chemical reaction equation:
4Al + 3O2 = 2Al2O3;
Let’s calculate the chemical amount of aluminum. To do this, we divide the weight of the existing substance by its molar weight.
M Al = 27 grams / mol;
N Al = 40 x (1-0.18) / 27 = 1.2148 mol;
When burning this amount of aluminum, 2 times less amount of aluminum oxide will be synthesized. Let’s determine its weight.
For this purpose, we multiply the amount of the synthesized substance by its molar weight.
M Al2O3 = 27 x 2 + 16 x 3 = 102 grams / mol;
N Al2O3 = 1.2148 / 2 = 0.6074 mol;
m Al2O3 = 0.6074 x 102 = 61.95 grams;
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.