The gravitational force is the weakest of the four fundamental forces. does that mean that the gravitational force does not have an important role in the universe? explain your answer.

No, gravity does have an important role in the universe. Gravity is what keeps the things on the plants, dwarf plant, comet, ect, in it. Without gravity, the water on Earth will just float around in space. Also, gravity is what is keeping the satellite (such as our moon) attach to the planets and dwarf planet.
Not sure if this helps

Since there is the same amount of agn03 in both silver chloride and silver nitrate they produce the same amount of moles. therefore silver chloride produces the same amount of silver nitrate, so your answer is 15.0 moles of silver nitrate. i hope this !

Sorry i dont understand the question can you rephase it?