A&E Maybe hope this helps you out for this subject
        
             
        
        
        
<span>The sum total of all the chemical reactions that occur in organisms is called-</span>Metabolism
        
             
        
        
        
Answer:
4 grams
Explanation:
If in an experiment, we have 4g of reactants, the mass of the products will also be 4g. 
This is in compliance with the law of conservation of mass in a chemical reaction. 
According to this law, 
   "in a chemical reaction, matter is neither created nor destroyed but changed from one form to another". 
If: 
       A + B →  C
          4g        4g 
mass of A and B must be equal to the mass of the product according to the law of conservation of mass.