Question

A gaseous phase reaction $A_2\to B+\frac{1}{2}C$ shows an increase in pressure from 100 mm to 120 mm in 5 min. Now, $-\frac{\Delta \left[A_2\right]}{\Delta t}$ should be:

• A. $8mm\text{-}{min}^{-1}$
• B. $4mm\text{-}{min}^{-1}$
• C. $16mm\text{-}{min}^{-1}$
• D. $2mm\text{-}{min}^{-1}$

Answer 1

The correct option is B $4mm\text{-}{min}^{-1}$

Change in pressure $=120-100=20mmHg$

Change in time $=5min$

$\therefore$ Rate$=\frac{20}{5}mmHgmi{n}^{-1}$

$=4mmHgmi{n}^{-1}$