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c3 (Moles, Relative formula mass, Conservation of mass, relative mass of a…

- - - - the amount products is dependant on the amount of reactants in the reaction
        
        in a chemical equation like [ 2(H2) + O2 > 2(H2O) ] 2 moles of hydrogen and 1 mole of oxygen are needed to make 2 moles of water. The ratio of hydrogen to oxygen needed is 2:1 to make water
        
        if i had 3 moles of hydrogen and 2 moles of oxygen, hydrogen is the limiting factor as it doesn't have 4 moles to make the 2:1 ratio of hydrogen and oxygen.
        
        limiting factor is the reactant that is all used up during the reaction
        
        because hydrogen is the limiting factor the water made will be 3 moles as the ratio of water made to hydrogen is 1:1
        
        therefore oxygen is in excess
        
        the 3 moles of hydrogen are used up reacting with the 1.5 moles of oxygen because that forms a 2:1 ratio so 0.5 moles of oxygen are left