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K Potasio 1 39.098 39.098
Mn Manganeso 1 54.938 54.938
O Oxígeno 4 15.999 63.998
KMnO4 Permanganato de potasio 158.034
moles = Molaridad x litros de solución = 0.900 x 0.700 = 0.630 moles
peso (g) = moles x g/mol = 0.630 x 158.034 = 99.56 g
saludos