Question

81. Formic acid HCHO2, is a convenient source of small quantities of carbon monoxide. When warmed with sulfuric acid, formic acid decomposes to give CO gas.

HCHO2(l) -> H2O(l) + CO(g)

If 3.85 L of carbon monoxide was collected over water at 25 degrees C and 689 mmHg, how many grams of formic acid were consumed?

I keep getting 6.53 g but the book says 6.34 g.
bobpursley
did you subtract the vapor pressure of water at 25C from the pressure?

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