40. Determine the empirical formula of polystyrene which is 92.3% C and 7.7% H. (Atomic weights: C = 12.01, H = 1.008).
(A) CH3
(B) CH2
(C) C2H
(D) C2H3
(E) CH

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統計： A(0), B(0), C(0), D(0), E(3) #2347816