6) There are two reactants in a chemical equation, and one product. The mass of the product is 40g. The mass of the first reactant is 16g. What must the mass of the second reactant be, if the equation is to follow the law of conservation of mass?

24g

Explanation:

mass of the product is 40g.

The mass of the first reactant is 16g

The mass of the second reactant  = ?

  Let the first reactant  = A

   Let the second reactant  = B

  Let the product  = C

Equation of reaction;

           A   +  B    →  C

           16g              40g

The mass of B must be  = 40 -16  = 24g

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