How does the concept of conservation of mass apply to chemical reactions? Group of answer choices

The reactants and products have exactly the same atoms.

The reactants and products have exactly the same molecules.

The change in the amount of matter is equal to the change in energy

The change in the amount of matter is only a small percentage of the total mass

A.(nh4)(2co3)is the correct answer 

It's potassium i believe

1. why does the same side of the moon always face earthc.the rotational period of the moon is equal to one revolution around earth2. which is greater the moons period of rotation or its period of revolution  b.the moons revolution period around earth3.what was the major accomplishment of the apollo missions  d.landing on and exploring the moon4. which of these space missions involved the deployment of lunar rovers d.apollo5. which scientists are going to explore next on kepler-186fd. evidence of existence of life6.which mission is not going to explore the outside of the solar systemb.safir7.which technology limit the future of space exploration b. scientist must first develop certain technologies before missions can be completed.