ooo T-Mobile LTE 11:43 AM ì±session.masteringchemistry.com C where Ï is a constant of 3.1416 and r is a variable for the radius of the circle. This equation allows us to calculate the area of any circle, as long as we know the radius. For example, if 5.00 cm, then (3.1416)(5.00 cm)2 78.5 cm? = = Notice that each symbol was replaced by its value. In other words, each number was substituted for its symbol in the equation. You do not need any science knowledge to perform the following calculations. Even though they involve concepts that you may not have learned yet, you can answer each question using only algebra and number substitution Part A The equation for density, d, is where m is mass and V is volume. What is the density, d, of a substance with a volume of V = 23.4 cm3 and a mass of m = 44.6 g? Express your answer numerically in grams per cubic c Hints entimeter. gleã¡ My Answers Give Up Part B The equation for molarity, M, is where V is volume and n is the number of moles of solute. A certain solution has a molarity of M 9.30 mol/L and has a volume of V = 0.630 L What is the value of n? Express your answer numerically in moles. , Hint Submit My Answers Give Up Part C The equation for photon energy, E, is