[FouRRaW]

so given the mass of a molecule in an equation how do you go about figuring out the mass of another molecule in the equation

Aa + Bb₂ ---> 2AB 

where uppercase equals numerical coefficents (moles i think)  and a b c and d equal elements lke you know what i mean

[Borek]

http://www.chembuddy.com/?left=balancing-stoichiometry&right=stoichiometric-calculations