Question

$n_1$ 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 of S. This reaction can be represented as $X+Y\to R+S$. The relation which can be established in the amounts of the reactants and the products will be :

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

Answer 1

The correct option is B $n_1+n_2=m_1+m_2$

The relation which can be established in the amounts of the reactants and the products will be as follows:

$\text{Total mass of reactants}=\text{Total mass of products}$

$n_1+n_2=m_1+m_2$

This is based on the law of conservation of mass.