Question

In g of substance X reacts with m g of substance Y to form p g of substance R and q g of substance S. This reaction can be represented as, $X + Y = R + S$. The relation which can be established in the amounts of the reactants and the products will be

• A. $n - m = p - q$
• B. $n + m = p + q$
• C. $n = m$
• D. $p = q$

Answer 1

Answer: (B)

$n + m = p + q$

Answer 2

$\underset{ng}{X} + \underset{mg}{Y}$⇌ $\underset{pg}{R} + \underset{qg}{S}$

$n + m = p + q$ by low of conservation of mass.