How can you demonstrate the law of conservation of mass?

The law of conservation of mass suggests that after a reaction, there is no change in the mass. It does not get bigger or smaller.

Using the chemical equation

For example, in the combustion reaction we have methane - CH4 and oxygen 02 which makes CO2 and H20

You need to balance this so you will end up getting

CH4 + 202 > CO2+2H20 (sorry I cant use the small formula numbers)

The mass of the products = mass of reactants which PROVES law conservation of mass :)

an ice cube will have the same mass as the water that forms as the cube melts.

h

number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.