Question

$0.01mol$ of iodoform $(CH{I_3})$ react with excess with $\left( {Ag} \right)$ powder to whose volume at NTP is
(A) $224ml$
(B) $112ml$
(C) $336ml$
(D) $448ml$

Answer 1

Gas has not a fixed shape and it takes the shape in which gas is filled in those containers. The particles of gases are spread uniformly in those containers in which it is filled. Gases particles move very speedily in the atmosphere.

Complete step by step answer:
Acetylene gas$(CH \equiv CH)$ acetylene gas also known as ethylene gas. When molecules of iodoform $(CH{I_3})$ and silver$\left( {Ag} \right)$ powder react with each other to produce acetylene gas or ethylene gas. This chemical reaction is written as-
$2CH{I_3} + 6Ag \to {C_2}{H_2} + 6AgI$
- From this reaction it is shown that when two moles of iodoform react with six moles of silver then it produces one mole of acetylene gas and six moles of silver iodide.
- If $2mole$ of iodoform can form one mole of acetylene gas then $0.01mol$ of iodoform will produce $\dfrac{1}{2} \times 0.01 = 0.005mole$ of acetylene formed.
As we know the volume of of gas at NTP$= 22.4L$
Then the volume occupied by $0.005mole$ of gas at NTP $= 22.4 \times O.OO5$
Then the volume occupied by $0.005mole$ of gas at NTP $= 0.112L$=$112ml$
It means the volume occupied by $0.005mole$ of gas at NTP is $112ml$
The correct answer is option “B” .

Note: This numerical can also be solved by the ideal gas equation. Ideal gas equation is $PV = nRT$ in which P= Pressure, V = volume, n = number of moles of gas, R = universal gas constant, T= temperature.
- Ideal gas is related to thermodynamics in which thermodynamics deals with the heat (is a form of energy) and is converted into other forms.
- Ideal gas equation is also known as a general gas equation; this equation is followed by only ideal gas. And the ideal gas may be defined as the gas which obeys all gas laws like Boyle's law, Charles law, Avogadro law.