Step-by-step explanation:
4Fe + 3O2 --> 2Fe2O3
Mass of iron = 35g
How many moles of iron react?
The relationship between mass and moles is given as;
Moles = mass / Molar mass
Molar mass of iron = 56g/mol
Number of moles = 35 / 56 = 0.625 mol
How many moles of oxygen molecules must react?
From the equation of the reaction;
4 mol of Fe reacts with 3 mol of Oxygen molecule
0.625 mol would react with x mol?
4 = 3
0.625 = x
x = 0.625 * 3 / 4 = 0.46875 mol
How many moles of product form?
From the equation of the reaction;
4 mol of Fe reacts to form 2 mol of Fe2O3
0.625 mol would form x mol of Fe2O3
4 = 2
0.625 = x
x = 0.625 * 2 / 4 = 0.3125 mol
What mass of product forms?
Moles = mass / Molar mass
Mass = Molar mass * Moles = 159.69 g/mol * 0.3125 mol = 49.9g