Question

In a chemical equation, the sum of the masses ______.

Answer 1

C. Of the products is equal to the reactants.

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Answer 2

Answer: of the products is equal to the reactants

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.

The balanced chemical equation for formation of water :

$2H_2+O_2\rightarrow 2H_2O$

mass of reactants = mass of hydrogen + mass of oxygen = $2mol\times 2g/mol+1\times 32g/mol=36g$

mass of product = mass of water =  $2mol\times 18g/mol=36g$