How do I identify methyl groups from pictures, Are all the ch3 groups in these pictures methyl or is there some kind of rule to classify them?

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

i think it is true since you can test the answer and can use observations to complete it.

i think its 100

i hope this !