How old is the idea that matter is composed of atoms?

What is the temperature of one mole of helium gas at stp?

Mitosis is a type of cell division that produces cells that are identical to the parent cell. meiosis is a different type of cell division that produces cells that carry have a genetic material of the parent cell. based on the information provided how do the purpose of mitosis and meiosis differ

If 1.8 l of water is added to 2.5l of a 7.0 molarity koh solution, what is the molarity of the new solution