What is the molar mass of a substance? A. The mass in grams of one mole of a substance

Or

B. The number of particles in one gram of a substance

List four observations that indicate that a chemical reaction may be taking place

How have the greenhouse gasses increased from the year 2000 to 2018

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.