Answer: I'm going to guess and say it is h2 or o2 I am not sure.
Explanation:
Molality is a measure of concentration that relates the moles of solute to the kilograms of solvent, it is described by the following equation:

We are given the molality(2.50m) and kilograms of solvent(0.500kg), so we solve for moles of solute from the equation:


To make a 2.50molal NaOH solution would be needed 1.25moles of solute
Answer: 1.25 moles
B , your products are on the right side of the reaction. The reactants are on the left side
True is the correct because helio means sun in greek and the sun is in the center of our universe
C) 3 Moles
This is because of the molecular structure shown in the image