If the combined mass of the reactants is 100 grams, then which of the following MUST be true?

the combined mass of the products is 100 grams

each product has a mass of 100 grams

each reactant has the same mass as each product

each reactant must produce 100 grams of product

Question

If the combined mass of the reactants is 100 grams, then which of the following MUST be true?
 
		
the combined mass of the products is 100 grams
 		
each product has a mass of 100 grams
 		
each reactant has the same mass as each product
 		
each reactant must produce 100 grams of product

anonymous · Answer

i think this could help you: http://en.wikipedia.org/wiki/Conservation_of_mass

anonymous · Answer

and this could help: http://www.youtube.com/watch?v=dExpJAECSL8

sinbearciante · Answer

Knowing that nothing is ever lost in the universe, it is the first one.