How many atoms are in 5.548 g of thorium

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

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.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?