Which piece of information is not necessary to calculate the force of gravity between two objects, a and b? a. the mass of object a. b. the mass of object b. c. the velocities of a and b. d. the distance between a and b.

Achemist reacted 57.50 grams of sodium metal with an excess amount of chlorine gas. the chemical reaction that occurred is shown. na + cl2 → nacl if the percentage yield of the reaction is 86%, what is the actual yield? show your work, including the use of stoichiometric calculations and conversion factors.