Answer:
Mass = 31 g
Explanation:
Given data:
Mass of phosphorus required = ?
Mass of oxygen = 40 g
Solution:
Chemical equation:
4P + 5O₂ → 2P₂O₅
Number of moles of oxygen:
Number of moles = mass/molar mass
Number of moles = 40 g/ 32 g/mol
Number of moles = 1.25 mol
Now we will compare the moles of P and oxygen.
O₂ : P
5 : 4
1.25 : 4/5×1.25 = 1
Mass of phosphorus:
Mass = number of moles × molar mass
Mass = 1 mol × 31 g/mol
Mass = 31 g
