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1g=1ml --> 1000g= 1dm3
n= #de moles de Bario
si en 1mol de Ba---- hay 137.37g de Ba
entonces en Xmol de Ba---- hay 44g
X= 0.320 (3cs) mol de Ba
ahora
M=n/v
n= 0.320
v=1dm3
M= 0.320/1
M=0.3mol.dm3