In a combustion reaction, if 30 g of methane is burned in 15 g of oxygen gas, how many grams of water is produced if 20 g of carbon dioxide is formed?

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

Yeah, but what are you trying to ask?

Burned piece of steel wool does not gain mass. so only d could be true.