Answer:
Option C = 150
Step-by-step explanation:
First of all we will understand what is law of conservation of mass.
Law of conservation of mass:
This law stated that, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six number of carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of chemical equation so this reaction followed the law of conservation of mass because mases are same on both side.
In given chemical reaction:
AB + CD → X
50 g + 100 g = 150 g
Thus option c is correct.