How is a theory and a hypothesis different

A hypothesis is a working explanation, where a theory is a well established explanation. So really hypothesis is a more of a "guess and check" "work in progress" and a theory is like a summary of overall explanation of the observed behavior. hope this helps

The molar mass of a substance is defined as the mass of 1 mol of that substance, expressed in grams per mole, and is equal to the mass of 6.022 × 10 23 atoms, molecules, or formula units of that substance.