In a titration experiment with your product, it took 1.33 ml of phenylmagnesium bromide to reach the endpoint (bright golden orange). what is the concentration of the phenylmagnesium bromide solution if you started with 75.1 mg of indicator? report you answer to 3 decimal places.

The indicator used is Salicyaldehyde phenylhydrazone
Formula of salicyaldehyde phenylhydrazone = C₁₃H₁₂N₂O
Molar mass = 212.253 g / mol
number of moles of indicator = (75.1 x 10⁻³ g) / 212.253 = 3.538 x 10⁻⁴ mol
mole ratio of the indicator and phenyl magnesium bromide is 1 : 1
So moles of the phenyl magnesium bromide are the same
Using the moles and volume to calculate molarity:
Molarity = moles / volume in liter
             = (3.538 x 10⁻⁴ mol) / (1.33 x 10⁻³ L) = 0.266 M
Therefore molarity (concentration) of the phenyl magnesium bromide is 0.266 M 

Nonmetals usually react by gaining electrons

The density would be 1.622