$n_1 \ g$ of substance $X$ reacts with $n_2 \ g$ of substance $Y$ to form $m_1 \ g$ of substance $R$ and $m_2 \ g$ of substance $S$. The reaction is represented as $X + Y \rightarrow R + S$. What is the relationship between the mass of the reactants and the mass of the products?

  • A
    $n_1 - n_2 = m_1 - m_2$
  • B
    $n_1 + n_2 = m_1 + m_2$
  • C
    $n_1 = n_2$
  • D
    $m_1 = m_2$

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