What happens to a scientific theory if new data show a flaw in one assumption of a theory?

Why is an elements atomic mass not listed as a whole number on the periodic table

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?

Asample of freon gas has a volume of 2.23 liters, a pressure of 4.85 kpa, and a temperature of -1.36°c. calculate the volume at a pressure of 1.38 kpa and a temperature of 5.5°c. (show work)