What is the molecular formula of HCO2 with the molar mass of 90.0 g/mol?

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What is the molecular formula of HCO2 with the molar mass of 90.0 g/mol?

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Answer 1 · 2015-11-15T21:59:26

You have, presumably, the empirical formula, which is the simplest whole number ration defining constituents in a species. The molecular formula is always a multiple of the empirical formula (and the multiple might be one!).

Explanation:

Empirical formula $=$ $=$ $H C O_{2}$ $HCO_2$ . The molecular formula (the multiple!) is ${(H C O_{2})}_{n}$ $(HCO_2)_n$ . So $(1.00794 + 12.011 + 2 \times 15.999) \cdot g \cdot m o l^{- 1} \times n = 90.0 \cdot g \cdot m o l^{- 1}$ $(1.00794 + 12.011+2xx15.999)*g*mol^-1xxn = 90.0*g*mol^-1$ .

Clearly $n$ $n$ $=$ $=$ $2$ $2$ and the molecular formula is $(H C O_{2}) \times 2$ $(HCO_2)xx2$ $=$ $=$ $? ?$ $??$ Is it oxalic acid?

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What is the molecular formula of HCO2 with the molar mass of 90.0 g/mol?

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