Which of the following describes the entropy change of a gas reaction? O A. The change in entropy cannot be predicted in a gas reaction.
B. If there is an increase in the number of gas molecules, then AS< 0.
C. If there is an increase in the number of gas molecules, then AS>0.
D. If there is an increase in the number of gas molecules, then AS = 0.

wanswer:

explanation:

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