- Why is potassium permanganate not used as a primary standard?

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What is a gravity field and how does it compare to an electrostatic power field? Alguém pode me ajudar? Encontre a área da região delimitada pelas curvas y=sinx, y=x, x=π/2 e x=π.? What is the equation in standar form of a perpendicular line that passes through (5,-1)? And what is the x-intercept of the perpendicular? What are four macromolecules that occur in nature including the building block units of each different macromolecule? What is the volume of this figure?