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What is the normality of an acid if 21.18 mL were needed to titrate 0.1369 g Na2CO3? F(x)= (x^3/2)-sinx+1 Find the tangent line approximation of f at pi/2? Perform the operation and write it in standard form. (-8x) (8x +7)? SO2 -> ? K2Cr2O7? Prove that A is dense in X iff A closure equals X. A subset X.?