Compare and contrast one mole of a compound and Avogadro's number of particles in a compound. What is the conversion factor between the two?

The answer for #3 is c but i don't know why

Calculate: select the worksheet tab. this tab you calculate the analyte concentration.  fill in the first set of boxes ("moles h2so4" and "moles naoh") based on the coefficients in the balanced equation. (if there is no coefficient, the value is 1.)  record the appropriate volumes in the "ml naoh" and "ml h2so4" boxes.  record the concentration of the titrant in the m naoh box. click calculate. what is the concentration listed

Asolid that forms and separates from a liquid mixture is called