how could you check that when the calcium carbonate is reacting with hydrochloric acid the gas given off is carbon dioxide (please give long answer )

The  grandmother cell  is a hypothetical  neuronthat represents a complex but specific concept or object.[1]  it activates when a person "sees, hears, or otherwise sensibly discriminates"[2]  a specific entity, such as his or her grandmother. the term was in use at least as early as 1966 amongst staff and students in the department of experimental psychology, university of cambridge, england. a similar concept, that of the  gnostic neuron, was proposed two years later

Adozen is 1221/12 = 1.751.75 x 12 = 21therefore, 1.75 is the answer.

The net force is 100