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Verified answer
M P = 3,1 grm O = 7,1 gr - 3,1 gr = 4 gr
n P : n O = ( m P / Ar P ) : ( m O : Ar O )
= ( 3,1 / 31 ) : ( 4 / 16 )
= 0,1 : 0,25
= 2 : 5
RE = P2O5 ( B )