Answer: C) 0.020 m
Explanation:
Molality of a solution is defined as the number of moles of solute dissolved per kg of the solvent.

where,
n = moles of solute
= weight of solvent in g
Mole fraction of
is =
i.e.
moles of
is present in 1 mole of solution.
Moles of solute
= 
moles of solvent (water) = 1 -
= 0.99
weight of solvent =
Molality =
Thus approximate molality of
in this solution is 0.020 m
<h2>Greetings!</h2>
Because 1 atm is equal to 760mm Hg, you can use the following equation to find the correct atm measurement:
atm x 760
Simply plug the values given in:
0.43 x 760 = 326.8mm Hg
<h2>Hope this helps!</h2>
The answer is C. Valence Electrons