NTA Abhyas JEE Main2020ChemistryChemical KineticsPractice
The decomposition of NH 3 on platinum surface is zero order reaction. What are the rates of production of N 2 and H 2 if k = 2.5 × 10 –4 mol L – 1 sec –1 ? 2NH 3 g → N 2 g + 3H 2 g
Options
- A1.25 × 10 − 4 M s − 1 , 3.75 × 10 − 4 M s − 1
- B3.00 × 10 − 4 M s − 1 , 7.50 × 10 − 4 M s − 1
- C2.50 × 10 − 4 M s − 1 , 1.25 × 10 − 4 M s − 1
- D3.75 × 10 − 4 M s − 1 , 2.50 × 10 − 4 M s − 1
Correct answer
A. 1.25 × 10 − 4 M s − 1 , 3.75 × 10 − 4 M s − 1
Step-by-step solution
2NH 3 g → N 2 g + 3H 2 g Rate = k[NH 3 ] o = k = 2.5 × 10 –4 M s –1 . 1 2 − d dt NH 3 = 1 1 d dt N 2 = 1 3 d dt H 2 d d t N 2 = 2 · 5 × 1 0 - 4 2 = 1 · 2 5 × 1 0 - 4 M s - 1 d d t H 2 = 3 2 × 2 · 5 × 1 0 - 4 = 3 · 7 5 × 1 0 - 4 M s - 1