Are these statements about the mass balance true?
Statement 1: Total mass of the system will remain the same but the constituent’s parts may change.
Statement 2: Chemical and biological changes affect the mass balance of a unit operation.
a) True, False
b) True, True
c) False, True
d) False, False

Answer: a
Explanation: Even though chemical and biological changes occur during a process, the total mass of the system will remain the same but the constituent’s parts may change. For example, in browning reaction, the total sugars may reduce but browning compounds in that product increases leading to mass balance.