In the chemical reaction below, sodium (na) and chlorine (cl) combine to form sodium chloride (nacl). 2na + cl2 → 2nacl if the combined mass of the starting reactants is 50 grams, then the mass of sodium chloride formed once the reaction has reached completion a. will be exactly 50 grams. b. will be exactly 100 grams. c. will be between 50 and 100 grams. d. will be less than 50 grams.

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?