A concentration-time study of the gas phase reaction 2 A3 → 3 A2 produced the data in the table below.
Time (s) [A3] (M) [A2] (M)
0 4.00 × 10-4 0
10 2.00 × 10-4 3.00 × 10-4
20 1.00 × 10-4 4.50 × 10-4
30 5.00 × 10-5 ?
What is the concentration of A2 after 30 seconds?
A) 5.00 × 10-4 M
B) 5.25 × 10-4 M
C) 5.50 × 10-4 M
D) 6.00 × 10-4 M