Chemical reactions question

Question

Dear experts,

Im having trouble answering this question:

In a balanced chemical reaction the weight

total of reagents compared to that of products:

1) is lower if gaseous products are formed

2) may be different in etherogenic phase reactions

3) is greater if the reaction is exothermic

4) is proportional to the sum of the respective

molecular weights

5) is always the same

I really don't understand how the weight of the reagents is the same with the on of products...

Answer 1

Conservation of Matter !!!

Matter is neither created nor destroyed in a chemical reaction. It is conserved.

So, #5 is correct.