The answer is: 2 NH3 —> N2 + 3 H2
112 km is travelled by car in 60 minutes
1 km is travelled by car in 60/112 minutes
56 km is travelled by car in 60/112*56 = 30 minutes = 0.5 hours
Explanation:
3.4 x10^3 best answer to the question
There are 12H 2Fe 15O and 3C