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ICSE Class 10 Chemistry Question 1 of 25

Gay Lussac's Law — Avogadro's Law — Mole Concept — Question 1

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Question 1

Nitrogen reacts with hydrogen to give ammonia. Calculate the volume of the ammonia gas formed when nitrogen reacts with 6 litres of hydrogen. All volumes measured at s.t.p.

Answer

[By Lussac's law]

N2+3H2⟶2NH31 vol.:3 vol.⟶2 vol.\begin{matrix} \text{N}_2 & + & 3\text{H}_2 & \longrightarrow & 2 \text{NH}_3 \\ 1 \text{ vol.} & : & 3 \text{ vol.} & \longrightarrow & 2\text{ vol.} \end{matrix}

To calculate the volume of ammonia gas formed.

H2:NH33:26:x\begin{matrix} \text{H}_2 & : & \text{NH}_3 \\ 3 & : & 2 \\ 6 & : & x \end{matrix}

Therefore,

23×6=x⇒x=4 lts\dfrac{2}{3} \times 6 = x \\[0.5em] \Rightarrow x = 4 \text{ lts}

Hence, volume of ammonia gas formed is 4 lts