Construct the ch3oh molecule and describe its polarity

Explanations:- In methanol, carbon is the central atom with four valence electrons to which three H and one O atoms are bonded via single covalent bonds. Oxygen has 6 valence electrons so it forms a single covalent bond with carbon and another single bond with the fourth H atom to complete it's octet.

Electron negativity difference of C and H is very low and so C-h bond is not like a polar bond.

O is more electron negative than H and C and so the C-O and O-H bonds are polar covalent bonds. So, the over all molecule is polar because of these polar C-O and O-H bonds.

Hydrogen bonding is also possible for this molecule as H is bonded to the more electron negative oxygen atom.

The structure is attached below:

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

i belive it is water