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Sarea de magneziu a unui acid monocarboxilic saturat contine 21,25% Mg(masa atomica a Mg este 24,3)Cum se numeste acidul?
A)acid formic
B)acid butaric
C)acid pentanoic
D)acid propanoic
E)acid acetic


Răspuns :

(R-COO)2Mg
24,3·100/M = 21,25       M = 114g/mol
2(R + 44) = 90    M R = 1   
(HCOO)2Mg       HCOOH