Answer:
The answer to your question is: 24 grams of D
Explanation:
To answer this question we need to remember the Lavoisier law of conservation of mass, which says that in a chemical reaction matter is neither created nor destroyed.
This means that the amount of matter stays the same.
Then, the reaction is
          A    +    B    ⇒    C    +    D
         26 g     12 g       14 g       x
mass               Â
of reactants    38 g                ?      mass of products, but it must be
                                     equal to the mass of products
Then         14g + x = 38
            x = 38 - 14
            x = 24 g of D                            Â
