NTA Abhyas 2020
- Exam
- NTA Abhyas
- Year
- 2020
- Subject
- Chemistry
- Chapter
- States of Matter
NTA Abhyas 2020 · Chemistry · States of Matter
An open vessel at 27 ^ o C is heated until 3/8 ^ th of the air in...
An open vessel at is heated until of the air in it has been expelled. Assuming that the volume remains constant, calculate the temperature at which the vessel was heated
Options
- A{\text{307}^{o} \text{C}
- B{\text{107}^{o} \text{C}
- C{\text{480}^{o} \text{C}
- D{\text{207}^{o} \text{C}
Correct answer
D. {\text{207}^{o} \text{C}
Step-by-step solution
If of the air is expelled out then remaining air
In the open vessel volume and pressure are both constant but moles are decreasing
∴ {\text{n}_{1} {T}_{1} \text{=}{n}_{2} {T}_{2}
∴ {\text{n}_{1} \text{\times}\text{300}\text{=}\left(\dfrac{5}{8} {n}_{1}\right){T}_{2}
= 480 - 273 = {\text{207}^{o} \text{C}
In the open vessel volume and pressure are both constant but moles are decreasing
∴ {\text{n}_{1} {T}_{1} \text{=}{n}_{2} {T}_{2}
∴ {\text{n}_{1} \text{\times}\text{300}\text{=}\left(\dfrac{5}{8} {n}_{1}\right){T}_{2}
= 480 - 273 = {\text{207}^{o} \text{C}