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m = 5 Kg del 70% HNO3 = 70/100 = 0.70 en peso
HNO3 = 84%/ 100 = 0.84 en peso
se divide el % entre 100 para obtener el peso
ahora X = es la cantidad de HNO3
0.94 x + (0.70 x 5) = 0.84 (x + 5)
0.94 x + 3.5 = 0.84 x + 4.2
0.94 x - 0.84 x = 4.2 - 3.5
0.1 x = 0.7 despejar x
x = 0.7 / 0.1 = 7 litros de HNO3 del 94 %