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masa cz: 31+31+(5x16)=142g/mol
P:
62/142 x 100%=43,7%
O:
80/142 x 100%=56,3%
m P₂O₅ = 2 * 31u + 5 * 16u = 142u
m P₂ - x
m P₂O₅ - 100%
x = 2 * 31u * 100% /142 u ≈ 44 %
mO₅ - x
m P₂O₅ - 100%
x= 5 *16u * 100% / 142 u ≈56%