🤓 Based on our data, we think this question is relevant for Professor Costanza's class at USF.
We’re being asked to determine the molecular formula of a Valproic Acid composed of C, H, and O given the combustion analysis, 0.165-g sample is combusted to produce 0.166 g of water and 0.403 g of carbon dioxide.
Recall that in combustion analysis, a compound reacts with excess O2 to form products.
For a compound composed of C, H, and O, the reaction looks like this:
CxHyOz + O2 (excess) → x CO2 + y H2O
This means we need to do the following steps:
Step 1: Calculate the mass of C and H in the compound.
Step 2: Calculate the mass of O in the compound.
Step 3: Determine the lowest whole number ratio of C, H, and O to get the empirical formula.
Step 4: Get the ratio of the molar mass and empirical mass to determine the molecular formula.
Valproic acid, used to treat seizures and bipolar disorder, is composed of C, H, and O. A 0.165-g sample is combusted to produce 0.166 g of water and 0.403 g of carbon dioxide.
If the molar mass is 144 g/mol, what is the molecular formula?