The following data is obtained during the first order thermal decomposition of 
at constant volume and temperature.
| S. | No. | Time |
| Total | pressure in | Pascal | |||||
S. | ||||||||||||
No. | ||||||||||||
Total | ||||||||||||
pressure in | ||||||||||||
Pascal | ||||||||||||
1. | At the end of 10 minutes | 300 | ||||||||||
2. | After completion | 200 |
The rate constant in 
is
Text Solution
Verified by ExpertsA
: 
At the end of reaction, only 1 mole of gas is present whose pressure is 200 pascal.
At the beginning of the reaction, 2 moles of gas should have a pressure of 400 pascal.
At the end of 10 minutes, no. of moles present
But the pressure of 2 moles 
pascal
Pressure due to 
moles of 
pascal
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