The abnormally high boiling point of HF as compared to HCl is primarily due to intermolecular forces of attraction called A)network bonds
B)electrovalent forces
C)hydrogen bonds
D)van der Waals forces

C)hydrogen bonds

Explanation:

The abnormally high boiling point of HF compared to HCl is primarily due to the intermolecular forces called hydrogen bonds.

Hydrogen bonds are intermolecular forces of attraction between polar molecules in which a hydrogen atom is directly joined to a highly electronegative atom (oxygen, nitrogen or fluorine).

Hydrogen bonds are very strong force of attraction compared to dipole - dipole attraction that holds the HCl together.

first, consult an activity series chart to determine if al is more reactive than fe. it is, so it will replace the fe. now, one can continue with the problem.

next, make sure you have a correctly balanced equation.

3feo + 2al ==> 3fe + al2o3

now, determine which reactant (feo or al) is in limiting supply.

moles feo present = 125 g x 1 mole/71.8 g = 1.74 moles

moles al present = 25.0 g x 1 mole/26.98 g = 0.927 moles

since from the balanced equation, it take 3 mol feo for every 2 mol al, al will be limiting.

you can determine this simply by dividing moles of each by their coefficient in the balanced equation. for example: 1.74/3 = 0.58 and 0.927/2 = 0.464. al is less, so it is limiting.

finally, using the stoichiometry in the balanced eq. determine mass of fe that can be produced from 0.927 moles of al.

0.927 moles al x 3 moles fe/2 moles al x 55.8 g/mole = 77.6 g

catya that's not even a b or c