The velocity of any wave can be calculated from its frequency and wavelength. how fast (in meters per second) is a wave moving if its six waves go by in a second and its wavelength is two meters?
a. 1/3
b. 3
c. 8
d. 12

Use the equation : V = wavelength x frequency 
                             V = 2 x 6 = 12 m/s
hope that helps

Distance and velocity graph

Molarity is moles of solute over liters of solution. idk if that is what you are talking about, but you can convert moles of solute to grams of solute using dimensional analyzes by using molar mass found on the periodic table.