When two atoms of the same element are covalently bonded, the radius of each atom will be half the distance between the two nuclei because they equally attract the electrons. The reason for this trend is that the bigger the radii, the further the distance between the two nuclei. Hope this helps:)
Hey there !:
Molarity is the amount of solute, in mol, dissolved in a volume of solution in Liters , so:
Moles of solute = 0.50 mol
Volume of solution = 6.50 L
Therefore:
Molarity = moles of solute / volume of solution
Molarity = 0.50 / 6.50
Molarity = 0.0769 M
Hope that helps!