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I am struggling with these final three questions. Any help would be greatly appreciated

1. Combustion of a compound formula CxHyOz yields 31.65g H2O and 96.65g CO2 when 77.31g of oxygen are used. If the molar mass of the compound is between 80and 130 g/mol, what is the molecular formula of this compound?

2. The skeletal structure of a compound isolated from fruits of the tree, Vitex agnuscastus, shown below

4 OH 3 I OC

How many hydrogen atoms are in this compound?

3. Complete the Lewis structure for the following molecule shown

H H-C-H | H-C C-C-C-N H O-U I-O C-I I-O-I

How many sigma bonds and pi bonds does this have?

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