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A chemist decided to determine the molec...

A chemist decided to determine the molecular formula of an unknown compound. He collects following informations: (P) Compound contains 2:1 H to O atom (number fo atoms).
(Q) Compound has 40% C by mass
(R) Approximate molecular mass of the compound is 178 g.
(S) Compound contains C,H and O only.
Which of the following could be molecular formula of compound?

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