4. A compound contains 49.48% C. 5.15% H, 16.50% O, and 28.87% N by mass. What is the empirical formula of this compound?
(A)C4H5N2O
(B)C6H5O3N
(C)61653387a13fb.jpg
(D)C4H8O3N
(E)6165339bd63c5.jpg

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統計： A(3), B(0), C(0), D(0), E(0) #2788652