Final answer:
In the formula Q=m x c x t, the quantity that is measured in units of J/g x degrees Celsius is c, which stands for specific heat.
Step-by-step explanation:
In the formula Q=m x c x t, the quantity that is measured in units of J/g x degrees Celsius is c. The symbol c stands for specific heat and depends on the material and phase. It is the amount of heat necessary to change the temperature of 1.00 kg of mass by 1.00 °C. The SI unit for specific heat is J/(kg x K) or J/(kg x °C).