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Some Basic Concepts of Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistrySome Basic Concepts of Chemistry1 Mark
MCQ
When two molecules of hydrogen react with one molecule of oxygen, the mass of reactants is $36,$ what is the mass of products?
  • A
    $18$
  • ✓
    $36$
  • C
    $9$
  • D
    $32$
✓

Answer

Correct option: B.
$36$
The Law of conservation of mass states that the total mass of reactants is equal to the total mass of products. In any chemical reaction, the total mass of the substance before and after the reaction is the same although its matter undergoes a physical change.
$\ce{2H_2 + O_2​ ⟶ 2H_2​O}$

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