150 cm 3 of nitrogen II oxide were sparked with100 cm 3 of oxygen, what
150 cm3 of nitrogen II oxide were sparked with100 cm3 of oxygen, what volume of nitrogen IV oxide will be produced at s.t.p?
- A) 100 cm3
- B) 75 cm3
- C) 50 cm3
- D) 150 cm3
Correct Answer: D) 150 cm3
Explanation
\(\begin{array}{llllcr}
& \mathrm{2NO} & + & \mathrm{O_2} & \longrightarrow & \mathrm{2NO_2} \\
\text{Initially} & \mathrm{150cm^3} & & \mathrm{100cm^3} & & \\
\text{Gay Lussac's Law} & \text{2 mols} & & \text{1 mol} & & \text{2 mols} \\
\text{Vol. used up for reac.} & \mathrm{150cm^3} & & \mathrm{75cm^3} & & \mathrm{150cm^3} \\
\end{array}\)
Vol. of oxygen left after reac. \(= \mathrm{100cm^3} - \mathrm{75cm^3} = \mathrm{25cm^3}\)
Vol. of nitrogen (IV) oxide prod. = \(\mathrm{150cm^3}\)
Note: According to Gay Lussac's Law, 2 volumes of nitrogen II oxide combine with 1 volume of oxygen to form 2 volumes of nitrogen IV oxide.