Lewis structure and thermochemistry problems

[staralfur]

Hi
I have a few questions that I have been working on but I don't get the right answer.

After drawing the Lewis dot structure of HOClO2, pick the incorrect statement of the following.
A. The oxygen bonded to the hydrogen has two lone pairs
B. the oxygens not bonded to hydrogen have three lone pairs
C. The O-Cl bonds are all double bonds.
D. The H-O bond is a single bond
E. Chlorine has a full octet.

The right answer is B.
I have been looking at this and I would have thought that this Lewis structure would be right as it has the lowest formal charge.
https://upload.wikimedia.org/wikipedia/commons/8/86/Chloric-acid-2D.pngThe The formal Charge for all the atoms would be zero.

If there are only single bonds between the two oxygen and chlorine the formal charge for each of the two oxygen bonded to chlorine would be: 6-6-(1/2)*2=-1
and for the chlorine it would be: 7-2-(1/2)*6=2

I would have thought that the incorrect answer is B and E also because the chlorine would then have an expanded octet.

Am I wrong?
Isn't the most abundant structure the one with the lowest formal charge?

I have another question.

Two solutions, 50.0 mL of 1.00M BaCl₂(aq) and 50.0mL of 1.00M Na₂SO₄(aq), both initially at 21.5 ^˚C, are added to a calorimeter with a total heat capacity, after the solutions are added, of 1.10 kJ/^˚C and the temperature rises to 22.7^˚C. Determine the q_rxn per mole of BaSO₄(s) formed in the reaction.
Answer is: -26.4 kJ/mol

My solution:
0.05 moles of Ba²⁺ and 0.05 moles of SO₄^2- make 0.05 mole of BaSO₄(s).
q=n*c*∆T
q=0.1*1100*1.2=132 Joules per 0.05 moles of BaSO₄(s) formed
132*1/(0.05)=2640 Joule/mole BaSO₄.
What am i doing wrong here?

 

[Bystander]

q=0.1*1100*1.2=132 Joules per 0.05 moles of BaSO4(s) formed

What's the point of multiplying by "0.1?"

 

[epenguin]

A-E are not alternatives, so more than one of them can be right. And I think more than one is.

 

[staralfur]

What's the point of multiplying by "0.1?"

I thought it was 0.1 as 0.05+0.05=0.1 moles = total moles of reactants.
But I have figured this one out. it says the TOTAL heat capacity is 1100 joules so q=c*∆T = 1100*1.2=1320 Joules. So 1320 Joules for every 0.05 moles formed 1320*1/0.05=26400 Joules