Kinetics (topic6) test - mistakes

Multiple choice number 5-
Ammonia decomposes on a tungsten catalyst according to the equation:
2NH3 (g) --> N2 (g) + 3H2O (g).
If the rate of dissapearance of NH3 is 0.030moldm-3s-1, what is the rate of appearance of H2 (in moldm-3s-1)?
A.0.020
B.0.030
C.0.045
D.0.068

rate of dissapearnace = rate of appearance.
2 ratio of NH3 while 3 ratio of H20.
0.030/2 = 0.015 per ratio
0.015X3 = 0.045 (3 ratio of H2O)

14a) when writing the numbers in the table, the numbers should have the same decimal point. i.e. if its 2 decimal, all of it needs to be 2dp including 0 (0.00).

14c) relate back to the mol per unit time