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WAEC - Chemistry (1990 - No. 16)

What is the molecular formula of a compound whose empirical formula is CH2O and molar mass is 180? (H = 1, C = 12, O = 16)
C 4H 8O2
C 4H 8O3
C 6H 10O5
C 6H 12O6
C 12H 22O11

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