PLEASE HELP 5F2(g)+2NH3(g )---> N2F4(g) +6HF(g)

How many molecules of NH3 are needed to produce 3.27 x 10^24 molecules of N2F4?
Please show the steps or explain it'll really help

it's 3.2 on edge, i just took the test.

answer;

18.5 seconds

explanation;

velocity is distance covered per unit time; it is given by displacement divided by time.

thus; time = displacement/velocity

total time = total displacement/velocity

total distance = 5000 meters south

total time = 5000/4.5

                  = 1111.11 seconds

but; 1 minute = 60 sec

thus; 1111.11 /60

                = 18.51 seconds

thus; the time taken is 18.5 seconds