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A 0.500-g sample of tin foil reacted with oxygen to give 0.635g of product. Calculate the empirical formula of the tin oxide.? 1,870,1706? I cannot find CCADD group? Find a, b and c so f (x) = ax2 + bx + c goes through the point (0, 1) and is tangent to the line y = 3x - 2 at the point (2, 4).? 1990 penny that has no copper plating?