Hat is the molar mass of a substance? the mass in grams of one mole of a substance the number of particles in one gram of a substance the number of moles in one gram of a substance the mass in grams of one particle of a substance

The molar mass is what would you find on the periodic table and it is used in the mole conversions within chemistry. So the answer would have to be A: the mass in grams of one mole of a substance. 

Particle exchange energy though elastic collision , hope this .

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.